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class="vector-toc-list"> </ul> </li> <li id="toc-United_Kingdom" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#United_Kingdom"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.3</span> <span>United Kingdom</span> </div> </a> <ul id="toc-United_Kingdom-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-United_States" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#United_States"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.4</span> <span>United States</span> </div> </a> <ul id="toc-United_States-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Specifications_(HUP-2)" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Specifications_(HUP-2)"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Specifications (HUP-2)</span> </div> </a> <ul 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href="https://es.wikipedia.org/wiki/Piasecki_HUP_Retriever" title="Piasecki HUP Retriever – Spanish" lang="es" hreflang="es" data-title="Piasecki HUP Retriever" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%BE%DB%8C%D8%A7%D8%B3%DA%A9%DB%8C_%D8%A7%DA%86%E2%80%8C%DB%8C%D9%88%D9%BE%DB%8C" title="پیاسکی اچ‌یوپی – Persian" lang="fa" hreflang="fa" data-title="پیاسکی اچ‌یوپی" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Piasecki_HUP" title="Piasecki HUP – French" lang="fr" hreflang="fr" data-title="Piasecki HUP" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Piasecki_H-25" title="Piasecki H-25 – Indonesian" lang="id" hreflang="id" data-title="Piasecki H-25" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Piasecki_H-25" title="Piasecki H-25 – Italian" lang="it" hreflang="it" data-title="Piasecki H-25" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/H-25_(%E8%88%AA%E7%A9%BA%E6%A9%9F)" title="H-25 (航空機) – Japanese" lang="ja" hreflang="ja" data-title="H-25 (航空機)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Piasecki_HUP_Retriever" title="Piasecki HUP Retriever – Polish" lang="pl" hreflang="pl" data-title="Piasecki HUP Retriever" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Piasecki_H-25" title="Piasecki H-25 – Russian" lang="ru" hreflang="ru" data-title="Piasecki H-25" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Piasecki_HUP_Retriever" title="Piasecki HUP Retriever – Slovenian" lang="sl" hreflang="sl" data-title="Piasecki HUP Retriever" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/Piasecki_HUP_Retriever" title="Piasecki HUP Retriever – Tajik" lang="tg" hreflang="tg" data-title="Piasecki HUP Retriever" data-language-autonym="Тоҷикӣ" data-language-local-name="Tajik" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Piasecki_HUP_Retriever" title="Piasecki HUP Retriever – Vietnamese" lang="vi" hreflang="vi" data-title="Piasecki HUP Retriever" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/HUP_%E5%B0%8B%E5%9B%9E%E7%8A%AC%E7%9B%B4%E5%8D%87%E6%A9%9F" title="HUP 尋回犬直升機 – Chinese" lang="zh" hreflang="zh" data-title="HUP 尋回犬直升機" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3382217#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a 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data-mw-deduplicate="TemplateStyles:r1248642317">.mw-parser-output .ib-aircraft .infobox-above{line-height:1.6em;background-color:#eee}.mw-parser-output .ib-aircraft .infobox-header{border-top:1px solid #a2a9b1;border-bottom:1px solid #a2a9b1;line-height:23px;background-color:#eee}.mw-parser-output .ib-aircraft-caption{padding:0.3em 0 0 0}.mw-parser-output .ib-aircraft-caption-left .infobox-full-data,.mw-parser-output .ib-aircraft-caption-left .infobox-data,.mw-parser-output .ib-aircraft-caption-left .infobox-label{text-align:left}.mw-parser-output .ib-aircraft .mergedbottomrow .infobox-full-data,.mw-parser-output .ib-aircraft .mergedbottomrow .infobox-data,.mw-parser-output .ib-aircraft .mergedbottomrow .infobox-label{border-bottom:1px solid #a2a9b1}@media(min-width:720px){.mw-parser-output .ib-aircraft .infobox-label{width:30%;padding-right:3px}.mw-parser-output .ib-aircraft .infobox-data{width:50%}}</style><table class="infobox ib-aircraft vcard"><tbody><tr><th colspan="2" class="infobox-above">H-25/HUP Retriever</th></tr><tr><td colspan="2" class="infobox-full-data"><span typeof="mw:File"><a href="/wiki/File:HUP-2_from_USS_FD_Roosevelt_(CVA-42)_in_flight_1959.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/HUP-2_from_USS_FD_Roosevelt_%28CVA-42%29_in_flight_1959.jpg/300px-HUP-2_from_USS_FD_Roosevelt_%28CVA-42%29_in_flight_1959.jpg" decoding="async" width="300" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/HUP-2_from_USS_FD_Roosevelt_%28CVA-42%29_in_flight_1959.jpg/450px-HUP-2_from_USS_FD_Roosevelt_%28CVA-42%29_in_flight_1959.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ab/HUP-2_from_USS_FD_Roosevelt_%28CVA-42%29_in_flight_1959.jpg/600px-HUP-2_from_USS_FD_Roosevelt_%28CVA-42%29_in_flight_1959.jpg 2x" data-file-width="1148" data-file-height="766" /></a></span> <div class="ib-aircraft-caption">A U.S. Navy HUP-2 from <a href="/wiki/USS_Franklin_D._Roosevelt" title="USS Franklin D. Roosevelt">USS <i>Franklin D. Roosevelt</i></a></div></td></tr><tr><th colspan="2" class="infobox-header">General information</th></tr><tr><th scope="row" class="infobox-label">Type</th><td class="infobox-data">Utility <a href="/wiki/Helicopter" title="Helicopter">helicopter</a></td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Aerospace_manufacturer" title="Aerospace manufacturer">Manufacturer</a></th><td class="infobox-data"><a href="/wiki/Piasecki_Helicopter" title="Piasecki Helicopter">Piasecki Helicopter</a></td></tr><tr><th scope="row" class="infobox-label">Primary users</th><td class="infobox-data"><a href="/wiki/United_States_Navy" title="United States Navy">United States Navy</a><div> <a href="/wiki/United_States_Army" title="United States Army">United States Army</a> <br /> <a href="/wiki/Royal_Canadian_Navy" title="Royal Canadian Navy">Royal Canadian Navy</a> <br /> <a href="/wiki/French_Navy" title="French Navy">French Navy</a> </div></td></tr><tr><th scope="row" class="infobox-label">Number built</th><td class="infobox-data">339<sup id="cite_ref-Boeing_HUP_1-0" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Disputed_statement" class="mw-redirect" title="Wikipedia:Disputed statement"><span title="This claim has reliable sources with contradicting facts (November 2018)">disputed</span></a> – <a href="/wiki/Talk:Piasecki_HUP_Retriever#Number_built" title="Talk:Piasecki HUP Retriever">discuss</a></i>]</sup></td></tr><tr><th colspan="2" class="infobox-header">History</th></tr><tr><th scope="row" class="infobox-label">Manufactured</th><td class="infobox-data">1949–1954<sup id="cite_ref-Boeing_HUP_1-1" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">Introduction date</th><td class="infobox-data">February 1949<sup id="cite_ref-SB1911_2-0" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">First flight</th><td class="infobox-data">March 1948</td></tr><tr><th scope="row" class="infobox-label">Retired</th><td class="infobox-data">1958 US Army<br />January 1964 RCN<br />1964 USN<br />1965 French Navy</td></tr></tbody></table> <p>The <b>Piasecki HUP Retriever</b> or <b>H-25 Army Mule</b>, later UH-25, is a compact single <a href="/wiki/Radial_engine" title="Radial engine">radial engine</a>, twin overlapping <a href="/wiki/Tandem_rotors" class="mw-redirect" title="Tandem rotors">tandem rotor</a> utility <a href="/wiki/Helicopter" title="Helicopter">helicopter</a> developed by the <a href="/wiki/Piasecki_Helicopter" title="Piasecki Helicopter">Piasecki Helicopter Corporation</a> of <a href="/wiki/Morton,_Pennsylvania" title="Morton, Pennsylvania">Morton, Pennsylvania</a>. Designed to a <a href="/wiki/United_States_Navy" title="United States Navy">United States Navy</a> specification, the helicopter was produced from 1949 to 1954, and was also used by the <a href="/wiki/United_States_Army" title="United States Army">United States Army</a> and foreign navies. The HUP/H-25 was the first helicopter to be produced with an <a href="/wiki/Autopilot" title="Autopilot">autopilot</a> and also the first to perform a <a href="/wiki/Aerobatic_maneuver#loop" title="Aerobatic maneuver">loop</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Design_and_development">Design and development</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=1" title="Edit section: Design and development"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Piasecki_XHJP-1_Retriever_at_Naval_Air_Station_Patuxent_River,_circa_in_1950_(NH_101806-KN).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Piasecki_XHJP-1_Retriever_at_Naval_Air_Station_Patuxent_River%2C_circa_in_1950_%28NH_101806-KN%29.jpg/220px-Piasecki_XHJP-1_Retriever_at_Naval_Air_Station_Patuxent_River%2C_circa_in_1950_%28NH_101806-KN%29.jpg" decoding="async" width="220" height="168" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Piasecki_XHJP-1_Retriever_at_Naval_Air_Station_Patuxent_River%2C_circa_in_1950_%28NH_101806-KN%29.jpg/330px-Piasecki_XHJP-1_Retriever_at_Naval_Air_Station_Patuxent_River%2C_circa_in_1950_%28NH_101806-KN%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Piasecki_XHJP-1_Retriever_at_Naval_Air_Station_Patuxent_River%2C_circa_in_1950_%28NH_101806-KN%29.jpg/440px-Piasecki_XHJP-1_Retriever_at_Naval_Air_Station_Patuxent_River%2C_circa_in_1950_%28NH_101806-KN%29.jpg 2x" data-file-width="3609" data-file-height="2757" /></a><figcaption>Piasecki XHJP-1</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Salon_du_Bourget_20090619_155.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Salon_du_Bourget_20090619_155.jpg/220px-Salon_du_Bourget_20090619_155.jpg" decoding="async" width="220" height="330" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Salon_du_Bourget_20090619_155.jpg/330px-Salon_du_Bourget_20090619_155.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Salon_du_Bourget_20090619_155.jpg/440px-Salon_du_Bourget_20090619_155.jpg 2x" data-file-width="2304" data-file-height="3456" /></a><figcaption>Head on view</figcaption></figure> <p>The design was a product of a competition by the U.S. Navy in 1945 for a compact utility/rescue helicopter to operate from ships including aircraft carriers, battleships, and cruisers.<sup id="cite_ref-Boeing_HUP_1-2" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Either 2<sup id="cite_ref-SB1911_2-1" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> or 3<sup id="cite_ref-archives_3-0" class="reference"><a href="#cite_note-archives-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Watkins_4-0" class="reference"><a href="#cite_note-Watkins-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Disputed_statement" class="mw-redirect" title="Wikipedia:Disputed statement"><span title="This claim has reliable sources with contradicting facts (November 2018)">disputed</span></a> – <a href="/wiki/Talk:Piasecki_HUP_Retriever#Number_built" title="Talk:Piasecki HUP Retriever">discuss</a></i>]</sup> prototypes—designated <b>PV-14</b> by the factory and <b>XHJP-1</b> by the Navy—were built and subjected to a side-by-side flight evaluation against the 3 prototypes of the <a href="/wiki/Sikorsky_XHJS-1" class="mw-redirect" title="Sikorsky XHJS-1">Sikorsky XHJS-1</a>; however, the XHJS was fundamentally a scaled-up version of the <a href="/wiki/Sikorsky_H-5" title="Sikorsky H-5">Sikorsky H-5</a>, and the increased weight and size magnified the design's problems with maintaining <a href="/wiki/Center_of_gravity_of_an_aircraft#Incorrect_weight_and_balance_in_helicopters" title="Center of gravity of an aircraft">proper weight and balance</a> under varying loading conditions.<sup id="cite_ref-archives_3-1" class="reference"><a href="#cite_note-archives-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The Piasecki won the competition,<sup id="cite_ref-archives_3-2" class="reference"><a href="#cite_note-archives-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> and with the introduction of the aircraft configuration letter "U" for Utility in the 1950s,<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> the aircraft was ordered for production as the <b>HUP-1</b>.<sup id="cite_ref-SB1911_2-2" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>The design featured two three-bladed, 35-foot-diameter (11 m) rotors in tandem in which blades could be folded for storage; the relatively small rotor diameter allowed the aircraft to use aircraft carrier elevators with its blades fully extended.<sup id="cite_ref-Boeing_HUP_1-3" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The tandem overlapping rotor configuration was a development by Piasecki and was used in future helicopter designs by the company and successors including the <a href="/wiki/Piasecki_H-21" title="Piasecki H-21">H-21</a>, <a href="/wiki/Boeing_Vertol_CH-46_Sea_Knight" title="Boeing Vertol CH-46 Sea Knight">HRB-1/CH-46</a>, and <a href="/wiki/CH-47" class="mw-redirect" title="CH-47">CH-47</a>. The original HUP-1 was powered by a single <a href="/wiki/Wright_R-975_Whirlwind#Production_by_Continental_Motors" title="Wright R-975 Whirlwind">Continental R-975-34</a> radial engine, with a take-off rating of 525 hp (391 kW), while later versions used the uprated R-975-42 or R-975-46A with 550 hp (410 kW).<sup id="cite_ref-SB1911_2-3" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> To aid <a href="/wiki/Search_and_rescue" title="Search and rescue">search and rescue</a> (SAR) operations, the aircraft was equipped with an overhead winch capable of lifting 400 lb (181 kg), which could lower a <a href="/wiki/Rescue_sling" class="mw-redirect" title="Rescue sling">rescue sling</a> through an electrically-operated door available after the copilot's seat was folded forward.<sup id="cite_ref-Boeing_HUP_1-4" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>During a flight demonstration of its capability to withstand high <a href="/wiki/G-force" title="G-force">g-force</a>, the type became the first helicopter to perform a <a href="/wiki/Aerobatic_maneuver#loop" title="Aerobatic maneuver">loop</a>, albeit unintentionally.<sup id="cite_ref-Boeing_HUP_1-5" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Operational_history">Operational history</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=2" title="Edit section: Operational history"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:PiaseckiHUP-2_Moffett_Field_(11569663403).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/PiaseckiHUP-2_Moffett_Field_%2811569663403%29.jpg/220px-PiaseckiHUP-2_Moffett_Field_%2811569663403%29.jpg" decoding="async" width="220" height="124" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/PiaseckiHUP-2_Moffett_Field_%2811569663403%29.jpg/330px-PiaseckiHUP-2_Moffett_Field_%2811569663403%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dd/PiaseckiHUP-2_Moffett_Field_%2811569663403%29.jpg/440px-PiaseckiHUP-2_Moffett_Field_%2811569663403%29.jpg 2x" data-file-width="3500" data-file-height="1972" /></a><figcaption>HUP-2 at Moffett Field</figcaption></figure> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:HUP-3_Retriever_of_HU-1_on_USS_Lexington_(CVA-16)_c1961.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/HUP-3_Retriever_of_HU-1_on_USS_Lexington_%28CVA-16%29_c1961.jpg/220px-HUP-3_Retriever_of_HU-1_on_USS_Lexington_%28CVA-16%29_c1961.jpg" decoding="async" width="220" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/HUP-3_Retriever_of_HU-1_on_USS_Lexington_%28CVA-16%29_c1961.jpg/330px-HUP-3_Retriever_of_HU-1_on_USS_Lexington_%28CVA-16%29_c1961.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a1/HUP-3_Retriever_of_HU-1_on_USS_Lexington_%28CVA-16%29_c1961.jpg/440px-HUP-3_Retriever_of_HU-1_on_USS_Lexington_%28CVA-16%29_c1961.jpg 2x" data-file-width="749" data-file-height="409" /></a><figcaption>HUP-3 Retriever on the USS Lexington</figcaption></figure> <p>The aircraft first entered service in February 1949 with the delivery of the first of 32 HUP-1 aircraft to the US Navy.<sup id="cite_ref-SB1911_2-4" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The improved <b>HUP-2</b> (Piasecki designation <b>PV-18</b>) was soon introduced with a more powerful engine, deletion of the inward-canted horizontal stabilizer endplate fins, and various minor changes in equipment; a sub-variant equipped with dunking <a href="/wiki/Sonar" title="Sonar">sonar</a> for <a href="/wiki/Anti-submarine_warfare" title="Anti-submarine warfare">anti-submarine warfare</a> was given the designation <b>HUP-2S</b>.<sup id="cite_ref-SB1911_2-5" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Boeing_HUP_1-6" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The HUP-2 was the first production helicopter equipped with an <a href="/wiki/Autopilot" title="Autopilot">autopilot</a>.<sup id="cite_ref-Boeing_HUP_1-7" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The US Navy also tested a <a href="/wiki/Radio_navigation" title="Radio navigation">radio navigation</a> system called <i>Raydist</i> that allowed an unmanned HUP-2 to be directed from a ground station and by radio ordered to hover within five feet (1.5 m) of the desired point.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Edo_Aircraft_Corporation" title="Edo Aircraft Corporation">Edo</a> tested a HUP-2 with a fiberglass hull and outrigger floats for amphibious operations.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>An upgraded version of the HUP-2 was built for the <a href="/wiki/US_Army" class="mw-redirect" title="US Army">US Army</a> and designated as the <b>H-25A Army Mule</b>, but most were quickly withdrawn from Army service and converted for naval use under the designation <b>HUP-3</b>.<sup id="cite_ref-SB1911_2-6" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Boeing_HUP_1-8" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Walker_RCN_8-0" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:330-ps-7528-usn-681155_16661806845_o.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/af/330-ps-7528-usn-681155_16661806845_o.jpg/220px-330-ps-7528-usn-681155_16661806845_o.jpg" decoding="async" width="220" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/af/330-ps-7528-usn-681155_16661806845_o.jpg/330px-330-ps-7528-usn-681155_16661806845_o.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/af/330-ps-7528-usn-681155_16661806845_o.jpg/440px-330-ps-7528-usn-681155_16661806845_o.jpg 2x" data-file-width="2732" data-file-height="2116" /></a><figcaption>A HUP on disaster relief mission in 1955 for <a href="/wiki/Hurricane_Janet" title="Hurricane Janet">Hurricane Janet</a></figcaption></figure> <p>In 1954, the <a href="/wiki/Royal_Canadian_Navy" title="Royal Canadian Navy">Royal Canadian Navy</a> received three former US Army H-25A aircraft, which were modified and redesignated on delivery to conform to US Navy HUP-3 standards.<sup id="cite_ref-Walker_RCN_8-1" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Shearwater_HUP-3_10-0" class="reference"><a href="#cite_note-Shearwater_HUP-3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The aircraft were used aboard <a href="/wiki/CCGS_Labrador" title="CCGS Labrador">HMCS <i>Labrador</i></a> for <a href="/wiki/Search_and_rescue" title="Search and rescue">search and rescue</a> and varied utility duties, and were later used to support construction at <a href="/wiki/Distant_Early_Warning_Line" title="Distant Early Warning Line">Distant Early Warning Line</a> radar sites.<sup id="cite_ref-Walker_RCN_8-2" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Shearwater_HUP-3_10-1" class="reference"><a href="#cite_note-Shearwater_HUP-3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The helicopters were subsequently posted to <a href="/wiki/Victoria_International_Airport" title="Victoria International Airport">NAF Patricia Bay</a> and naval air station <a href="/wiki/CFB_Shearwater" class="mw-redirect" title="CFB Shearwater">HMCS <i>Shearwater</i></a>; after the last two were stricken from inventory on 18 January 1964, one aircraft was donated to a technical school and the other two were sold as surplus.<sup id="cite_ref-Walker_RCN_8-3" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Shearwater_HUP-3_10-2" class="reference"><a href="#cite_note-Shearwater_HUP-3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>The US Army <b>H-25</b> designation was adopted by the US Navy in 1962<sup id="cite_ref-SB1911_2-7" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> on introduction of the <a href="/wiki/1962_United_States_Tri-Service_aircraft_designation_system" title="1962 United States Tri-Service aircraft designation system">1962 United States Tri-Service aircraft designation system</a>. The final units were withdrawn from US service in 1964.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (October 2018)">citation needed</span></a></i>]</sup> It also served with <a href="/wiki/French_Naval_Aviation" title="French Naval Aviation">French Naval Aviation</a> (Aeronavale) from 1953<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="Need more info on French service (October 2018)">citation needed</span></a></i>]</sup> to 1965.<sup id="cite_ref-Boeing_HUP_1-9" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>A total of 339 aircraft were delivered during the 6-year production run.<sup id="cite_ref-Boeing_HUP_1-10" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Disputed_statement" class="mw-redirect" title="Wikipedia:Disputed statement"><span title="This claim has reliable sources with contradicting facts (November 2018)">disputed</span></a> – <a href="/wiki/Talk:Piasecki_HUP_Retriever#Number_built" title="Talk:Piasecki HUP Retriever">discuss</a></i>]</sup> A large number of surplus US Navy aircraft later appeared on the US civil registry, and at least seven were transferred to the <a href="/wiki/French_Navy" title="French Navy">French Navy</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (September 2022)">citation needed</span></a></i>]</sup> </p><p>On 7 November 2009, former US Navy HUP-1, <a href="/wiki/BuNo" class="mw-redirect" title="BuNo">BuNo</a> <i>124925</i>,<sup id="cite_ref-Allnutt_11-0" class="reference"><a href="#cite_note-Allnutt-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> civil registration number <i>N183YP</i>,<sup id="cite_ref-NTSB_N183YP_12-0" class="reference"><a href="#cite_note-NTSB_N183YP-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> collided with high-voltage power lines in <a href="/wiki/Adelanto,_California" title="Adelanto, California">Adelanto, California</a>; the subsequent crash and post-crash fire killed all 3 occupants and substantially damaged the aircraft.<sup id="cite_ref-NTSB_N183YP_12-1" class="reference"><a href="#cite_note-NTSB_N183YP-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> Operated in association with <a href="/wiki/Classic_Rotors_Museum" title="Classic Rotors Museum">Classic Rotors</a>, the accident aircraft was the only airworthy example in the world.<sup id="cite_ref-Allnutt_11-1" class="reference"><a href="#cite_note-Allnutt-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/National_Transportation_Safety_Board" title="National Transportation Safety Board">National Transportation Safety Board</a> attributed the crash to <i>"The pilot’s failure to maintain clearance from powerlines during en route flight."</i><sup id="cite_ref-NTSB_N183YP_12-2" class="reference"><a href="#cite_note-NTSB_N183YP-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Variants">Variants</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=3" title="Edit section: Variants"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:HUP-3_of_HU-1_delivers_mail_to_USS_Turner_Joy_(DD-951)_c1962.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/58/HUP-3_of_HU-1_delivers_mail_to_USS_Turner_Joy_%28DD-951%29_c1962.jpg/220px-HUP-3_of_HU-1_delivers_mail_to_USS_Turner_Joy_%28DD-951%29_c1962.jpg" decoding="async" width="220" height="275" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/58/HUP-3_of_HU-1_delivers_mail_to_USS_Turner_Joy_%28DD-951%29_c1962.jpg/330px-HUP-3_of_HU-1_delivers_mail_to_USS_Turner_Joy_%28DD-951%29_c1962.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/58/HUP-3_of_HU-1_delivers_mail_to_USS_Turner_Joy_%28DD-951%29_c1962.jpg/440px-HUP-3_of_HU-1_delivers_mail_to_USS_Turner_Joy_%28DD-951%29_c1962.jpg 2x" data-file-width="831" data-file-height="1037" /></a><figcaption>HUP-3 delivers mail to the <a href="/wiki/USS_Turner_Joy" title="USS Turner Joy">USS <i>Turner Joy</i> (DD-951)</a></figcaption></figure> <dl><dt>XHJP-1</dt> <dd>Prototype, powered by a 525 hp (391 kW) <a href="/wiki/Continental_R-975" class="mw-redirect" title="Continental R-975">Continental R-975</a>-34 piston engine, equipped with large sloping endplate fins on the horizontal stabilizers. Piasecki-Vertol designation was <b>PV-14</b>. 2<sup id="cite_ref-SB1911_2-8" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> or 3<sup id="cite_ref-archives_3-3" class="reference"><a href="#cite_note-archives-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Watkins_4-1" class="reference"><a href="#cite_note-Watkins-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> produced.<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Disputed_statement" class="mw-redirect" title="Wikipedia:Disputed statement"><span title="This claim has reliable sources with contradicting facts (November 2018)">disputed</span></a> – <a href="/wiki/Talk:Piasecki_HUP_Retriever#Number_built" title="Talk:Piasecki HUP Retriever">discuss</a></i>]</sup></dd></dl> <dl><dt>HUP-1</dt> <dd>Utility transport and search and rescue helicopter for the <a href="/wiki/US_Navy" class="mw-redirect" title="US Navy">US Navy</a>, largely similar to XHJP-1, Piasecki designation was <b>PV-18</b>. 32 built.<sup id="cite_ref-SB1911_2-9" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Boeing_HUP_1-11" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></dd></dl> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Piasecki_HUP_of_HU-2_rescues_pilot_near_USS_Block_Island_(CVE-106)_on_12_August_1953.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Piasecki_HUP_of_HU-2_rescues_pilot_near_USS_Block_Island_%28CVE-106%29_on_12_August_1953.jpg/220px-Piasecki_HUP_of_HU-2_rescues_pilot_near_USS_Block_Island_%28CVE-106%29_on_12_August_1953.jpg" decoding="async" width="220" height="121" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Piasecki_HUP_of_HU-2_rescues_pilot_near_USS_Block_Island_%28CVE-106%29_on_12_August_1953.jpg/330px-Piasecki_HUP_of_HU-2_rescues_pilot_near_USS_Block_Island_%28CVE-106%29_on_12_August_1953.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Piasecki_HUP_of_HU-2_rescues_pilot_near_USS_Block_Island_%28CVE-106%29_on_12_August_1953.jpg/440px-Piasecki_HUP_of_HU-2_rescues_pilot_near_USS_Block_Island_%28CVE-106%29_on_12_August_1953.jpg 2x" data-file-width="804" data-file-height="444" /></a><figcaption>A U.S. Navy HUP <a href="/wiki/Plane_guard" title="Plane guard">plane guard</a> conducting a rescue in 1953</figcaption></figure> <dl><dt>HUP-2</dt> <dd>Improved version, 550 hp (410 kW) Continental R-975-42 piston engine, horizontal stabilizer endplate fins eliminated.<sup id="cite_ref-SB1911_2-10" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Boeing_HUP_1-12" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> 165 built for the US Navy,<sup id="cite_ref-SB1911_2-11" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Disputed_statement" class="mw-redirect" title="Wikipedia:Disputed statement"><span title="This claim has reliable sources with contradicting facts (November 2018)">disputed</span></a> – <a href="/wiki/Talk:Piasecki_HUP_Retriever#Number_built" title="Talk:Piasecki HUP Retriever">discuss</a></i>]</sup> 15 for French Aeronavale.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="Need more info on French service (October 2018)">citation needed</span></a></i>]</sup> Redesignated <b>UH-25B</b> in 1962.</dd></dl> <dl><dt>HUP-2S</dt> <dd>Anti-submarine warfare version of HUP-2 fitted with dunking sonar. 12 built.<sup id="cite_ref-Boeing_HUP_1-13" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></dd></dl> <dl><dt>HUP-3</dt> <dd>Naval utility conversion of H-25A aircraft transferred from US Army: 50 to US Navy, 3 to Royal Canadian Navy.<sup id="cite_ref-Walker_RCN_8-4" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></dd></dl> <dl><dt>H-25A Army Mule</dt> <dd>Utility transport helicopter for US Army, similar to HUP-2 but powered by a 550 hp (410 kW) Continental R-975-46A piston engine, and fitted with large doors, power-boosted controls, and strengthened floors.<sup id="cite_ref-SB1911_2-12" class="reference"><a href="#cite_note-SB1911-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Boeing_HUP_1-14" class="reference"><a href="#cite_note-Boeing_HUP-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> 70 were delivered from 1953, but they were unsuitable for front-line use,<sup id="cite_ref-Harding_p197-8_13-0" class="reference"><a href="#cite_note-Harding_p197-8-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> with 53 transferred to the Royal Canadian and US Navies in 1954–1955,<sup id="cite_ref-Walker_RCN_8-5" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> and the remaining helicopters used for training, being withdrawn from army service by 1958.<sup id="cite_ref-Harding_p197-8_13-1" class="reference"><a href="#cite_note-Harding_p197-8-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></dd></dl> <dl><dt>UH-25B</dt> <dd>HUP-2 redesignated after 1962.</dd></dl> <dl><dt>UH-25C</dt> <dd>HUP-3 redesignated after 1962.</dd></dl> <div class="mw-heading mw-heading2"><h2 id="Operators">Operators</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=4" title="Edit section: Operators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:French_HUP_landing_on_HMS_Albion_(R07)_1957.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4e/French_HUP_landing_on_HMS_Albion_%28R07%29_1957.jpg/220px-French_HUP_landing_on_HMS_Albion_%28R07%29_1957.jpg" decoding="async" width="220" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4e/French_HUP_landing_on_HMS_Albion_%28R07%29_1957.jpg/330px-French_HUP_landing_on_HMS_Albion_%28R07%29_1957.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4e/French_HUP_landing_on_HMS_Albion_%28R07%29_1957.jpg/440px-French_HUP_landing_on_HMS_Albion_%28R07%29_1957.jpg 2x" data-file-width="800" data-file-height="617" /></a><figcaption>French HUP lands on <a href="/wiki/HMS_Albion_(R07)" title="HMS Albion (R07)">HMS <i>Albion</i> (R07)</a> in 1957</figcaption></figure> <dl><dt><span class="flagicon"><span class="mw-image-border" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Flag_of_Canada_%281921%E2%80%931957%29.svg/23px-Flag_of_Canada_%281921%E2%80%931957%29.svg.png" decoding="async" width="23" height="12" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Flag_of_Canada_%281921%E2%80%931957%29.svg/35px-Flag_of_Canada_%281921%E2%80%931957%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Flag_of_Canada_%281921%E2%80%931957%29.svg/46px-Flag_of_Canada_%281921%E2%80%931957%29.svg.png 2x" data-file-width="1000" data-file-height="500" /></span></span> </span><a href="/wiki/Canada" title="Canada">Canada</a></dt></dl> <ul><li><a href="/wiki/Royal_Canadian_Navy" title="Royal Canadian Navy">Royal Canadian Navy</a><sup id="cite_ref-Piasecki_H-25_History_14-0" class="reference"><a href="#cite_note-Piasecki_H-25_History-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></li></ul> <dl><dt><span class="flagicon"><span class="mw-image-border" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/c/c3/Flag_of_France.svg/23px-Flag_of_France.svg.png" decoding="async" width="23" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/c/c3/Flag_of_France.svg/35px-Flag_of_France.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/c/c3/Flag_of_France.svg/45px-Flag_of_France.svg.png 2x" data-file-width="900" data-file-height="600" /></span></span> </span><a href="/wiki/France" title="France">France</a></dt></dl> <ul><li><a href="/wiki/French_Navy" title="French Navy">French Navy</a><sup id="cite_ref-Piasecki_H-25_History_14-1" class="reference"><a href="#cite_note-Piasecki_H-25_History-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup></li></ul> <dl><dt><span class="flagicon"><span class="mw-image-border" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Flag_of_the_United_States_%2823px%29.png/23px-Flag_of_the_United_States_%2823px%29.png" decoding="async" width="23" height="13" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Flag_of_the_United_States_%2823px%29.png/35px-Flag_of_the_United_States_%2823px%29.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Flag_of_the_United_States_%2823px%29.png/46px-Flag_of_the_United_States_%2823px%29.png 2x" data-file-width="69" data-file-height="39" /></span></span> </span><a href="/wiki/United_States" title="United States">United States</a></dt> <dd></dd></dl> <ul><li><a href="/wiki/United_States_Army" title="United States Army">United States Army</a><sup id="cite_ref-Piasecki_H-25_History_14-2" class="reference"><a href="#cite_note-Piasecki_H-25_History-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/United_States_Navy" title="United States Navy">United States Navy</a><sup id="cite_ref-Piasecki_H-25_History_14-3" class="reference"><a href="#cite_note-Piasecki_H-25_History-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Surviving_aircraft">Surviving aircraft</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=5" title="Edit section: Surviving aircraft"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:HUP3-01A.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/06/HUP3-01A.JPG/220px-HUP3-01A.JPG" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/06/HUP3-01A.JPG/330px-HUP3-01A.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/06/HUP3-01A.JPG/440px-HUP3-01A.JPG 2x" data-file-width="750" data-file-height="502" /></a><figcaption>Royal Canadian Navy HUP-3 <i>51-16621</i> at the <a href="/wiki/Canadian_Museum_of_Flight" title="Canadian Museum of Flight">Canadian Museum of Flight</a>; this aircraft was later traded to <a href="/wiki/Classic_Rotors_Museum" title="Classic Rotors Museum">Classic Rotors</a>.<sup id="cite_ref-Shearwater_HUP-3_10-3" class="reference"><a href="#cite_note-Shearwater_HUP-3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Piasecki_H-25A_116616_Fort_Rucker_AL_14.12.02R_edited-2.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Piasecki_H-25A_116616_Fort_Rucker_AL_14.12.02R_edited-2.jpg/220px-Piasecki_H-25A_116616_Fort_Rucker_AL_14.12.02R_edited-2.jpg" decoding="async" width="220" height="135" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Piasecki_H-25A_116616_Fort_Rucker_AL_14.12.02R_edited-2.jpg/330px-Piasecki_H-25A_116616_Fort_Rucker_AL_14.12.02R_edited-2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Piasecki_H-25A_116616_Fort_Rucker_AL_14.12.02R_edited-2.jpg/440px-Piasecki_H-25A_116616_Fort_Rucker_AL_14.12.02R_edited-2.jpg 2x" data-file-width="1086" data-file-height="667" /></a><figcaption>H-25A Army Mule preserved in the US Army Aviation Museum, Alabama</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Salon_du_Bourget_20090619_153.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Salon_du_Bourget_20090619_153.jpg/220px-Salon_du_Bourget_20090619_153.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Salon_du_Bourget_20090619_153.jpg/330px-Salon_du_Bourget_20090619_153.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Salon_du_Bourget_20090619_153.jpg/440px-Salon_du_Bourget_20090619_153.jpg 2x" data-file-width="3456" data-file-height="2304" /></a><figcaption>French H-25/HUP at the 2009 Paris Air Show</figcaption></figure> <p>For surviving aircraft, hyphenated numbers are original US Army Serial Numbers; six-digit numbers are original US Navy Bureau of Aeronautics (BuAer) Bureau Numbers (BuNo). All 50 H-25A/HUP-3 aircraft transferred from the US Army to the US Navy were given new bureau numbers; 3 aircraft transferred to the Royal Canadian Navy were redesignated, but retained their original US Army serial numbers.<sup id="cite_ref-Walker_RCN_8-6" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Canada">Canada</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=6" title="Edit section: Canada"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dt>On display</dt></dl> <ul><li>UH-25B (HUP-2) 128529 at <a href="/wiki/Shearwater_Aviation_Museum" title="Shearwater Aviation Museum">Shearwater Aviation Museum</a> in Shearwater, Nova Scotia.<sup id="cite_ref-Skaarup_16-0" class="reference"><a href="#cite_note-Skaarup-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> This aircraft has been restored to the appearance of <i>51-16621</i>, the first Royal Canadian Navy HUP-3.<sup id="cite_ref-Shearwater_HUP-3_10-4" class="reference"><a href="#cite_note-Shearwater_HUP-3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup></li> <li>UH-25C (HUP-3), 51-16623 - <a href="/wiki/Canada_Aviation_and_Space_Museum" title="Canada Aviation and Space Museum">Canada Aviation and Space Museum</a> in Ottawa, Ontario.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Netherlands">Netherlands</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=7" title="Edit section: Netherlands"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>UH-25B (HUP-2), 130076 (construction number 253) – Baris Business Park roadway roundabout in <a href="/wiki/Rotterdam" title="Rotterdam">Rotterdam</a>. This aircraft was originally used by the US Navy and was later transferred to the <a href="/wiki/French_Navy" title="French Navy">French Navy</a>.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="United_Kingdom">United Kingdom</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=8" title="Edit section: United Kingdom"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>UH-25C (HUP-3), 51-16622 – displayed at <a href="/wiki/The_Helicopter_Museum_(Weston)" class="mw-redirect" title="The Helicopter Museum (Weston)">The Helicopter Museum</a> in Weston-super-Mare, England, wearing Canadian markings.<sup id="cite_ref-Walker_RCN_8-7" class="reference"><a href="#cite_note-Walker_RCN-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="United_States">United States</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=9" title="Edit section: United States"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dt>On display</dt></dl> <dl><dt><dl><dt>H-25A Army Mule</dt></dl></dt></dl> <ul><li>51-16616 – <a href="/wiki/United_States_Army_Aviation_Museum" title="United States Army Aviation Museum">United States Army Aviation Museum</a> in Fort Rucker, Alabama.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup></li></ul> <dl><dt><dl><dt>HUP-1</dt></dl></dt></dl> <ul><li>124915 – <a href="/wiki/USS_Hornet_Museum" class="mw-redirect" title="USS Hornet Museum">USS Hornet Museum</a> in Alameda, California.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup></li></ul> <dl><dt><dl><dt>UH-25B (HUP-2)</dt></dl></dt></dl> <ul><li>128479 – <a href="/wiki/American_Helicopter_Museum" title="American Helicopter Museum">American Helicopter Museum</a> in West Chester, Pennsylvania.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup></li> <li>128517 – <a href="/wiki/Wings_of_Freedom_Aviation_Museum" title="Wings of Freedom Aviation Museum">Wings of Freedom Aviation Museum</a> in Horsham, Pennsylvania.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup></li> <li>128519 – <a href="/wiki/Intrepid_Sea,_Air_%26_Space_Museum" class="mw-redirect" title="Intrepid Sea, Air & Space Museum">Intrepid Sea, Air & Space Museum</a> in New York City, New York.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup></li> <li>128596 – <a href="/wiki/Flying_Leatherneck_Aviation_Museum" title="Flying Leatherneck Aviation Museum">Flying Leatherneck Aviation Museum</a> in San Diego, California.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup></li></ul> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Piasecki_HUP-2_Retriever_130059_(7170804388).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Piasecki_HUP-2_Retriever_130059_%287170804388%29.jpg/220px-Piasecki_HUP-2_Retriever_130059_%287170804388%29.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Piasecki_HUP-2_Retriever_130059_%287170804388%29.jpg/330px-Piasecki_HUP-2_Retriever_130059_%287170804388%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Piasecki_HUP-2_Retriever_130059_%287170804388%29.jpg/440px-Piasecki_HUP-2_Retriever_130059_%287170804388%29.jpg 2x" data-file-width="1024" data-file-height="683" /></a><figcaption>HUP-2 Retriever at the USS Midway museum</figcaption></figure> <ul><li>130059 – <a href="/wiki/USS_Midway_Museum" title="USS Midway Museum">USS Midway Museum</a> in San Diego, California.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup></li> <li>130082 – on the deck of the <a href="/wiki/USS_Iowa_Museum" title="USS Iowa Museum">USS Iowa Museum</a> in San Pedro, California.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup></li></ul> <dl><dt><dl><dt>UH-25C (HUP-3)</dt></dl></dt></dl> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Air_Zoo_December_2019_094_(Piasecki_HUP-3_Retriever).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/37/Air_Zoo_December_2019_094_%28Piasecki_HUP-3_Retriever%29.jpg/220px-Air_Zoo_December_2019_094_%28Piasecki_HUP-3_Retriever%29.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/37/Air_Zoo_December_2019_094_%28Piasecki_HUP-3_Retriever%29.jpg/330px-Air_Zoo_December_2019_094_%28Piasecki_HUP-3_Retriever%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/37/Air_Zoo_December_2019_094_%28Piasecki_HUP-3_Retriever%29.jpg/440px-Air_Zoo_December_2019_094_%28Piasecki_HUP-3_Retriever%29.jpg 2x" data-file-width="6000" data-file-height="4000" /></a><figcaption>HUP-3 Retriever on display at the <a href="/wiki/Air_Zoo" title="Air Zoo">Air Zoo</a></figcaption></figure> <ul><li>147595 – <a href="/wiki/Pima_Air_%26_Space_Museum" title="Pima Air & Space Museum">Pima Air & Space Museum</a> in Tucson, Arizona.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup></li> <li>147600 – <a href="/wiki/Air_Zoo" title="Air Zoo">Air Zoo</a> in Kalamazoo, Michigan.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup></li> <li>147607 – <a href="/wiki/National_Naval_Aviation_Museum" title="National Naval Aviation Museum">National Naval Aviation Museum</a> in Pensacola, Florida.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup></li> <li>147628 – <a href="/wiki/Mid-America_Air_Museum" title="Mid-America Air Museum">Mid-America Air Museum</a> in Liberal, Kansas.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup></li> <li>51-16621 – <a href="/wiki/Classic_Rotors_Museum" title="Classic Rotors Museum">Classic Rotors</a> in Ramona, California.<sup id="cite_ref-N7089F_34-0" class="reference"><a href="#cite_note-N7089F-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> As of December 2019, this is the only Piasecki Helicopter-manufactured aircraft with valid <a href="/wiki/FAA" class="mw-redirect" title="FAA">FAA</a> <a href="/wiki/Aircraft_registration" title="Aircraft registration">aircraft registration</a>.<sup id="cite_ref-FAA_Piasecki_35-0" class="reference"><a href="#cite_note-FAA_Piasecki-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> This former Royal Canadian Navy aircraft is reportedly the last HUP/H-25 capable of being restored to <a href="/wiki/Airworthy" class="mw-redirect" title="Airworthy">airworthy</a> condition; it was exchanged in 2000 by the <a href="/wiki/Canadian_Museum_of_Flight" title="Canadian Museum of Flight">Canadian Museum of Flight</a> for unflyable HUP-2 <i>128529</i>, which was subsequently traded again in 2002 to the Shearwater Aviation Museum and repainted as <i>51-16621</i>.<sup id="cite_ref-Shearwater_HUP-3_10-5" class="reference"><a href="#cite_note-Shearwater_HUP-3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Skaarup_16-1" class="reference"><a href="#cite_note-Skaarup-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup></li></ul> <dl><dt>Under restoration or in storage</dt></dl> <dl><dt><dl><dt>UH-25B (HUP-2)</dt></dl></dt></dl> <ul><li>128598 - Stored at <a href="/wiki/New_England_Air_Museum" title="New England Air Museum">New England Air Museum</a> in <a href="/wiki/Windsor_Locks,_Connecticut" title="Windsor Locks, Connecticut">Windsor Locks, Connecticut</a>.<sup id="cite_ref-Demobbed_36-0" class="reference"><a href="#cite_note-Demobbed-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup></li> <li>130053 – Stored at <a href="/wiki/Quartzsite,_Arizona" title="Quartzsite, Arizona">Quartzsite, Arizona</a>.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup></li> <li>130063 - Stored at New England Air Museum in Windsor Locks, Connecticut.<sup id="cite_ref-Demobbed_36-1" class="reference"><a href="#cite_note-Demobbed-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup></li></ul> <dl><dt><dl><dt>UH-25C (HUP-3)</dt></dl></dt></dl> <ul><li>147610 – <a href="/wiki/Yanks_Air_Museum" title="Yanks Air Museum">Yanks Air Museum</a> in Chino, California, in storage.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Specifications_(HUP-2)"><span id="Specifications_.28HUP-2.29"></span>Specifications (HUP-2)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=10" title="Edit section: Specifications (HUP-2)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File"><a href="/wiki/File:Piasecki_H-25_orthographical_image.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Piasecki_H-25_orthographical_image.svg/350px-Piasecki_H-25_orthographical_image.svg.png" decoding="async" width="350" height="254" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Piasecki_H-25_orthographical_image.svg/525px-Piasecki_H-25_orthographical_image.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Piasecki_H-25_orthographical_image.svg/700px-Piasecki_H-25_orthographical_image.svg.png 2x" data-file-width="1400" data-file-height="1015" /></a><figcaption></figcaption></figure> <p style="font-size: 90%; margin:0;"><i>Data from</i> <i>Jane's All The World's Aircraft 1956–57.</i><sup id="cite_ref-jawa56_p345_39-0" class="reference"><a href="#cite_note-jawa56_p345-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup></p><p><span style="font-size:120%"><b>General characteristics</b></span> </p><ul><li><b>Crew:</b> two</li> <li><b>Capacity:</b> four passengers</li> <li><b>Length:</b> 56 ft 11 in (17.35 m)</li> <li><b>Height:</b> 13 ft 2 in (4.01 m)</li> <li><b>Empty weight:</b> 4,132 lb (1,874 kg)</li> <li><b>Gross weight:</b> 5,750 lb (2,608 kg)</li> <li><b>Max takeoff weight:</b> 6,100 lb (2,767 kg)</li> <li><b>Powerplant:</b> 1 × <a href="/wiki/Continental_R-975-46A" class="mw-redirect" title="Continental R-975-46A">Continental R-975-46A</a> 9-cylinder air-cooled radial piston engine, 550 hp (410 kW)</li> <li><b>Main rotor diameter:</b> 2 × 35 ft 0 in (10.67 m)</li> <li><b>Main rotor area:</b> 1,924.5 sq ft (178.79 m<sup>2</sup>) * <b>Blade section:</b> <a href="/wiki/NACA_airfoil" title="NACA airfoil">NACA 0012</a><sup id="cite_ref-Selig_40-0" class="reference"><a href="#cite_note-Selig-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup></li></ul> <p><span style="font-size:120%"><b>Performance</b></span> </p> <ul><li><b>Maximum speed:</b> 105 mph (169 km/h, 91 kn)</li> <li><b>Cruise speed:</b> 80 mph (130 km/h, 70 kn)</li> <li><b>Range:</b> 340 mi (550 km, 300 nmi)</li> <li><b>Service ceiling:</b> 10,000 ft (3,000 m)</li> <li><b>Rate of climb:</b> 1,000 ft/min (5.1 m/s)</li> <li><b>Disk loading:</b> 3 lb/sq ft (15 kg/m<sup>2</sup>)</li> <li><b><a href="/wiki/Power-to-weight_ratio" title="Power-to-weight ratio">Power/mass</a>:</b> 0.09 hp/lb (0.15 kW/kg)</li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=11" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p> <b>Related development</b> </p> <ul><li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">Piasecki H-21</a></li> <li><a href="/wiki/Boeing_Vertol_CH-46_Sea_Knight" title="Boeing Vertol CH-46 Sea Knight">CH-46 Sea Knight</a></li></ul> <p><b>Aircraft of comparable role, configuration, and era</b> </p> <ul><li><a href="/wiki/Bell_HSL" title="Bell HSL">Bell HSL</a></li> <li><a href="/wiki/Bristol_Belvedere" title="Bristol Belvedere">Bristol Belvedere</a></li> <li><a href="/wiki/Harbin_Z-5" title="Harbin Z-5">Harbin Z-5</a></li> <li><a href="/wiki/Mil_Mi-4" title="Mil Mi-4">Mil Mi-4</a></li> <li><a href="/wiki/Sikorsky_H-19_Chickasaw" title="Sikorsky H-19 Chickasaw">Sikorsky H-19 Chickasaw</a></li></ul> <p class="mw-empty-elt"> </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=12" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dt>Notes</dt></dl> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-Boeing_HUP-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Boeing_HUP_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-5"><sup><i><b>f</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-6"><sup><i><b>g</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-7"><sup><i><b>h</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-8"><sup><i><b>i</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-9"><sup><i><b>j</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-10"><sup><i><b>k</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-11"><sup><i><b>l</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-12"><sup><i><b>m</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-13"><sup><i><b>n</b></i></sup></a> <a href="#cite_ref-Boeing_HUP_1-14"><sup><i><b>o</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output 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Boeing. Archived from <a rel="nofollow" class="external text" href="http://www.boeing.com/history/boeing/hup.html">the original</a> on 2012-10-29<span class="reference-accessdate">. Retrieved <span class="nowrap">2013-02-02</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Piasecki+H-25+History&rft.pub=Boeing&rft_id=http%3A%2F%2Fwww.boeing.com%2Fhistory%2Fboeing%2Fhup.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.pictaero.com/en/pictures/picture,47204">"Piasecki PV-18 (HUP/H-25/UH-25) (Photo)"</a>. pictaero.com<span class="reference-accessdate">. Retrieved <span class="nowrap">2 February</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Piasecki+PV-18+%28HUP%2FH-25%2FUH-25%29+%28Photo%29&rft.pub=pictaero.com&rft_id=http%3A%2F%2Fwww.pictaero.com%2Fen%2Fpictures%2Fpicture%2C47204&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-Skaarup-16"><span class="mw-cite-backlink">^ <a href="#cite_ref-Skaarup_16-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Skaarup_16-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSkaarup2009" class="citation book cs1">Skaarup, Howard (2009). <i>Canadian Warplanes</i>. Bloomington, Indiana: iUniverse. p. 520. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4401-6758-4" title="Special:BookSources/978-1-4401-6758-4"><bdi>978-1-4401-6758-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Canadian+Warplanes&rft.place=Bloomington%2C+Indiana&rft.pages=520&rft.pub=iUniverse&rft.date=2009&rft.isbn=978-1-4401-6758-4&rft.aulast=Skaarup&rft.aufirst=Howard&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=9090">"Piasecki HUP Retriever/51-16623."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFCanada_Aviation_and_Space_Museum" class="citation web cs1"><a href="/wiki/Canada_Aviation_and_Space_Museum" title="Canada Aviation and Space Museum">Canada Aviation and Space Museum</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170207022704/http://casmuseum.techno-science.ca/en/collection-research/artifact-piasecki-hup-3.php">"Piasecki HUP-3"</a>. <i>techno-science.ca</i>. Archived from <a rel="nofollow" class="external text" href="http://casmuseum.techno-science.ca/en/collection-research/artifact-piasecki-hup-3.php">the original</a> on 7 February 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">5 May</span> 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=techno-science.ca&rft.atitle=Piasecki+HUP-3&rft.au=Canada+Aviation+and+Space+Museum&rft_id=http%3A%2F%2Fcasmuseum.techno-science.ca%2Fen%2Fcollection-research%2Fartifact-piasecki-hup-3.php&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1 cs1-prop-foreign-lang-source"><a rel="nofollow" class="external text" href="https://www.baris.nl/onze-helikopter/">"De helikopter"</a> [The helicopter]. <i>www.baris.nl</i> (in Dutch). Baris Groep. 11 November 2013<span class="reference-accessdate">. Retrieved <span class="nowrap">1 November</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.baris.nl&rft.atitle=De+helikopter&rft.date=2013-11-11&rft_id=https%3A%2F%2Fwww.baris.nl%2Fonze-helikopter%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=11752">"Piasecki HUP Retriever/622 RCN."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=17233">"Piasecki HUP Retriever/51-16616."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-22">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=10923">"Piasecki HUP Retriever/124915."</a> <i>aerialvisuals.ca</i> Retrieved: 25 April 2017.</span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=63563">"Piasecki HUP Retriever/128479."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://wingsoffreedommuseum.org/index.php/our-aircraft/13-aircraft/aircraft-rotorcraft/33-aircraft-hup-2-retriever">"Piasecki HUP-2 "Retriever"<span class="cs1-kern-right"></span>"</a>. Wings of Freedom Aviation Museum<span class="reference-accessdate">. Retrieved <span class="nowrap">26 August</span> 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Piasecki+HUP-2+%22Retriever%22&rft.pub=Wings+of+Freedom+Aviation+Museum&rft_id=http%3A%2F%2Fwingsoffreedommuseum.org%2Findex.php%2Four-aircraft%2F13-aircraft%2Faircraft-rotorcraft%2F33-aircraft-hup-2-retriever&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=35971">"Piasecki HUP Retriever/128519."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-26"><span class="mw-cite-backlink"><b><a href="#cite_ref-26">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=419">"Piasecki HUP Retriever/128596."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-27">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=29266">"Piasecki HUP Retriever/130059."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-28"><span class="mw-cite-backlink"><b><a href="#cite_ref-28">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.dailybreeze.com/general-news/20161018/historic-wartime-helicopter-to-be-pieced-together-for-san-pedros-battleship-iowa">"Piasecki HUP Retriever/130082."</a> <i>Daily Breeze</i> Retrieved: 25 April 2017.</span> </li> <li id="cite_note-29"><span class="mw-cite-backlink"><b><a href="#cite_ref-29">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPacific_Battleship_Center2019" class="citation web cs1"><a href="/wiki/USS_Iowa_Museum" title="USS Iowa Museum">Pacific Battleship Center</a> (2019). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200424002946/https://www.pacificbattleship.com/visit-us/special-exhibits/">"New Exhibits"</a>. <i>pacificbattleship.com</i>. Archived from <a rel="nofollow" class="external text" href="https://www.pacificbattleship.com/visit-us/special-exhibits">the original</a> on 24 April 2020<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=pacificbattleship.com&rft.atitle=New+Exhibits&rft.date=2019&rft.au=Pacific+Battleship+Center&rft_id=https%3A%2F%2Fwww.pacificbattleship.com%2Fvisit-us%2Fspecial-exhibits&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-30"><span class="mw-cite-backlink"><b><a href="#cite_ref-30">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=34520">"Piasecki HUP Retriever/147595."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-31"><span class="mw-cite-backlink"><b><a href="#cite_ref-31">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=10772">"Piasecki HUP Retriever/147600"</a>. <i>www.aerialvisuals.ca</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2016-06-08</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.aerialvisuals.ca&rft.atitle=Piasecki+HUP+Retriever%2F147600&rft_id=http%3A%2F%2Fwww.aerialvisuals.ca%2FAirframeDossier.php%3FSerial%3D10772&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-32"><span class="mw-cite-backlink"><b><a href="#cite_ref-32">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=26108">"Piasecki HUP Retriever/147607."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-33"><span class="mw-cite-backlink"><b><a href="#cite_ref-33">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=75028">"Piasecki HUP Retriever/147628."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-N7089F-34"><span class="mw-cite-backlink"><b><a href="#cite_ref-N7089F_34-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFederal_Aviation_Administration2018" class="citation web cs1"><a href="/wiki/Federal_Aviation_Administration" title="Federal Aviation Administration">Federal Aviation Administration</a> (1 November 2018). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20181106005032/https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=7089F">"N-Number Inquiry Results N7089F"</a>. Archived from <a rel="nofollow" class="external text" href="https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=7089F">the original</a> on 6 November 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">1 November</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=N-Number+Inquiry+Results+N7089F&rft.date=2018-11-01&rft.au=Federal+Aviation+Administration&rft_id=https%3A%2F%2Fregistry.faa.gov%2Faircraftinquiry%2FNNum_Results.aspx%3FNNumbertxt%3D7089F&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-FAA_Piasecki-35"><span class="mw-cite-backlink"><b><a href="#cite_ref-FAA_Piasecki_35-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFederal_Aviation_Administration2019" class="citation web cs1"><a href="/wiki/Federal_Aviation_Administration" title="Federal Aviation Administration">Federal Aviation Administration</a> (16 December 2019). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200104033145/https://registry.faa.gov/aircraftinquiry/AcftRef_Results.aspx?Mfrtxt=PIASECKI&Modeltxt=&PageNo=1">"Manufacturer Inquiry Results Piasecki"</a>. Archived from <a rel="nofollow" class="external text" href="https://registry.faa.gov/aircraftinquiry/AcftRef_Results.aspx?Mfrtxt=PIASECKI&Modeltxt=&PageNo=1">the original</a> on 4 January 2020<span class="reference-accessdate">. Retrieved <span class="nowrap">16 December</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Manufacturer+Inquiry+Results+Piasecki&rft.date=2019-12-16&rft.au=Federal+Aviation+Administration&rft_id=https%3A%2F%2Fregistry.faa.gov%2Faircraftinquiry%2FAcftRef_Results.aspx%3FMfrtxt%3DPIASECKI%26Modeltxt%3D%26PageNo%3D1&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-Demobbed-36"><span class="mw-cite-backlink">^ <a href="#cite_ref-Demobbed_36-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Demobbed_36-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.usdemobbed.org.uk/locations.php?location=6388">"Bradley - Museum, Connecticut"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 September</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Bradley+-+Museum%2C+Connecticut&rft_id=http%3A%2F%2Fwww.usdemobbed.org.uk%2Flocations.php%3Flocation%3D6388&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> <li id="cite_note-37"><span class="mw-cite-backlink"><b><a href="#cite_ref-37">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.aerialvisuals.ca/AirframeDossier.php?Serial=33423">"Piasecki HUP Retriever/130053."</a> <i>aerialvisuals.ca</i> Retrieved: 15 July 2021.</span> </li> <li id="cite_note-38"><span class="mw-cite-backlink"><b><a href="#cite_ref-38">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.aerialvisuals.ca/AirframeDossier.php?Serial=161310">"Piasecki HUP Retriever/147610."</a> <i>aerialvisuals.ca</i> Retrieved: 5 May 2016.</span> </li> <li id="cite_note-jawa56_p345-39"><span class="mw-cite-backlink"><b><a href="#cite_ref-jawa56_p345_39-0">^</a></b></span> <span class="reference-text">Bridgman 1956, p. 345.</span> </li> <li id="cite_note-Selig-40"><span class="mw-cite-backlink"><b><a href="#cite_ref-Selig_40-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLednicer" class="citation web cs1">Lednicer, David. <a rel="nofollow" class="external text" href="https://m-selig.ae.illinois.edu/ads/aircraft.html">"The Incomplete Guide to Airfoil Usage"</a>. <i>m-selig.ae.illinois.edu</i><span class="reference-accessdate">. Retrieved <span class="nowrap">16 April</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=m-selig.ae.illinois.edu&rft.atitle=The+Incomplete+Guide+to+Airfoil+Usage&rft.aulast=Lednicer&rft.aufirst=David&rft_id=https%3A%2F%2Fm-selig.ae.illinois.edu%2Fads%2Faircraft.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span></span> </li> </ol></div></div> <dl><dt>Bibliography</dt></dl> <ul><li>Bridgman, Leonard. <i>Jane's All The World's Aircraft 1956–57</i>. New York: The McGraw-Hill Book Company, 1956.</li> <li>Harding, Stephen. <i>U.S. Army Aircraft Since 1947</i>. Shrewsbury, UK:Airlife, 1990. <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-85310-102-8" title="Special:BookSources/1-85310-102-8">1-85310-102-8</a>.</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSwanboroughBowers1976" class="citation book cs1">Swanborough, Gordon; Bowers, Peter M. (1976). <i>United States Navy Aircraft since 1911</i> (2nd ed.). Annapolis, Maryland: Naval Institute Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-87021-968-5" title="Special:BookSources/0-87021-968-5"><bdi>0-87021-968-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=United+States+Navy+Aircraft+since+1911&rft.place=Annapolis%2C+Maryland&rft.edition=2nd&rft.pub=Naval+Institute+Press&rft.date=1976&rft.isbn=0-87021-968-5&rft.aulast=Swanborough&rft.aufirst=Gordon&rft.au=Bowers%2C+Peter+M.&rfr_id=info%3Asid%2Fen.wikipedia.org%3APiasecki+HUP+Retriever" class="Z3988"></span>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Piasecki_HUP_Retriever&action=edit&section=13" title="Edit section: External links"><span>edit</span></a><span 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srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; font-style: italic;"><a href="https://commons.wikimedia.org/wiki/Category:Piasecki_HUP_Retriever" class="extiw" title="commons:Category:Piasecki HUP Retriever">Piasecki HUP Retriever</a></span>.</div></div> </div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080506193518/http://www.redstone.army.mil/history/aviation/factsheets/h25.html">H-25 US Army Aviation history fact sheet</a></li> <li><a rel="nofollow" class="external text" href="https://www.airhistory.net/photo/321359/N183YP/124925">HUP Retriever warbird at the 2002 Chino Air Show</a></li></ul> <div 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style="font-size:114%;margin:0 4em"><a href="/wiki/Piasecki_Helicopter" title="Piasecki Helicopter">Piasecki Helicopter, Vertol</a>, and <a href="/wiki/Boeing_Rotorcraft_Systems" title="Boeing Rotorcraft Systems">Boeing Rotorcraft Systems</a> model numbers</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Piasecki_PV-1&action=edit&redlink=1" class="new" title="Piasecki PV-1 (page does not exist)">1</a></li> <li><a href="/wiki/Piasecki_PV-2" title="Piasecki PV-2">2</a></li> <li><a href="/wiki/Piasecki_HRP_Rescuer" title="Piasecki HRP Rescuer">3</a></li> <li><a href="/w/index.php?title=Piasecki_PV-11&action=edit&redlink=1" class="new" title="Piasecki PV-11 (page does not exist)">11</a></li> <li><a class="mw-selflink selflink">12</a></li> <li><a class="mw-selflink selflink">14</a></li> <li><a href="/wiki/Piasecki_H-16_Transporter" title="Piasecki H-16 Transporter">15</a></li> <li><a href="/wiki/Piasecki_HRP_Rescuer" title="Piasecki HRP Rescuer">17</a></li> <li><a class="mw-selflink selflink">18</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">21</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">22</a></li> <li><a href="/w/index.php?title=Piasecki_PH-26&action=edit&redlink=1" class="new" title="Piasecki PH-26 (page does not exist)">26</a></li> <li><a href="/w/index.php?title=Piasecki_PH-29&action=edit&redlink=1" class="new" title="Piasecki PH-29 (page does not exist)">29</a></li> <li><a href="/w/index.php?title=Piasecki_PH-32&action=edit&redlink=1" class="new" title="Piasecki PH-32 (page does not exist)">32</a></li> <li><a href="/w/index.php?title=Piasecki_PH-34&action=edit&redlink=1" class="new" title="Piasecki PH-34 (page does not exist)">34</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">42</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">43</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">44</a></li> <li><a href="/wiki/Piasecki_H-16_Transporter" title="Piasecki H-16 Transporter">45</a></li> <li><a href="/w/index.php?title=Piasecki_PH-47&action=edit&redlink=1" class="new" title="Piasecki PH-47 (page does not exist)">47</a></li> <li><a href="/w/index.php?title=Piasecki_PH-49&action=edit&redlink=1" class="new" title="Piasecki PH-49 (page does not exist)">49</a></li> <li><a href="/w/index.php?title=Piasecki_PH-51&action=edit&redlink=1" class="new" title="Piasecki PH-51 (page does not exist)">51</a></li> <li><a class="mw-selflink selflink">63</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">71</a></li> <li><a href="/wiki/Vertol_VZ-2" title="Vertol VZ-2">76</a></li> <li><a href="/w/index.php?title=Vertol_V-82&action=edit&redlink=1" class="new" title="Vertol V-82 (page does not exist)">82</a></li> <li><a href="/w/index.php?title=Vertol_V-90&action=edit&redlink=1" class="new" title="Vertol V-90 (page does not exist)">90</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">105</a></li> <li><a href="/wiki/Boeing_Vertol_CH-46_Sea_Knight" title="Boeing Vertol CH-46 Sea Knight">107</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">114</a></li> <li><a href="/w/index.php?title=Vertol_V-119&action=edit&redlink=1" class="new" title="Vertol V-119 (page does not exist)">119</a></li> <li><a href="/w/index.php?title=Vertol_V-129&action=edit&redlink=1" class="new" title="Vertol V-129 (page does not exist)">129</a></li> <li><a href="/w/index.php?title=Vertol_V-137&action=edit&redlink=1" class="new" title="Vertol V-137 (page does not exist)">137</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">141</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">143</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">145</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-147&action=edit&redlink=1" class="new" title="Boeing Vertol BV-147 (page does not exist)">147</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-150&action=edit&redlink=1" class="new" title="Boeing Vertol BV-150 (page does not exist)">150</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-157&action=edit&redlink=1" class="new" title="Boeing Vertol BV-157 (page does not exist)">157</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-160&action=edit&redlink=1" class="new" title="Boeing Vertol BV-160 (page does not exist)">160</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">165</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-166&action=edit&redlink=1" class="new" title="Boeing Vertol BV-166 (page does not exist)">166</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-167&action=edit&redlink=1" class="new" title="Boeing Vertol BV-167 (page does not exist)">167</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">173</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">176</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-177&action=edit&redlink=1" class="new" title="Boeing Vertol BV-177 (page does not exist)">177</a></li> <li><a href="/wiki/Boeing_Vertol_YUH-61" title="Boeing Vertol YUH-61">179</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-180&action=edit&redlink=1" class="new" title="Boeing Vertol BV-180 (page does not exist)">180</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-210&action=edit&redlink=1" class="new" title="Boeing Vertol BV-210 (page does not exist)">210</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-213&action=edit&redlink=1" class="new" title="Boeing Vertol BV-213 (page does not exist)">213</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-215&action=edit&redlink=1" class="new" title="Boeing Vertol BV-215 (page does not exist)">215</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">216</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">219</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-222&action=edit&redlink=1" class="new" title="Boeing Vertol BV-222 (page does not exist)">222</a></li> <li><a href="/wiki/Boeing_Vertol_XCH-62" title="Boeing Vertol XCH-62">227</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">234</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-235&action=edit&redlink=1" class="new" title="Boeing Vertol BV-235 (page does not exist)">235</a></li> <li><a href="/wiki/Boeing_Vertol_XCH-62" title="Boeing Vertol XCH-62">237</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-297&action=edit&redlink=1" class="new" title="Boeing Vertol BV-297 (page does not exist)">297</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-298&action=edit&redlink=1" class="new" title="Boeing Vertol BV-298 (page does not exist)">298</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-299&action=edit&redlink=1" class="new" title="Boeing Vertol BV-299 (page does not exist)">299</a></li> <li><a href="/wiki/Boeing_Vertol_XCH-62" title="Boeing Vertol XCH-62">301</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-307&action=edit&redlink=1" class="new" title="Boeing Vertol BV-307 (page does not exist)">307</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">308</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">309</a></li> <li><a href="/w/index.php?title=Boeing_Vertol_BV-340&action=edit&redlink=1" class="new" title="Boeing Vertol BV-340 (page does not exist)">340</a></li> <li><a href="/wiki/Boeing_Vertol_BV-347" title="Boeing Vertol BV-347">347</a></li> <li><a href="/wiki/Boeing_Chinook_(UK_variants)" title="Boeing Chinook (UK variants)">352</a></li> <li><a href="/wiki/Boeing_Model_360" title="Boeing Model 360">360</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">414</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Piasecki_Helicopter/Vertol/Piasecki_Aircraft" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Piasecki/Vertol_aircraft" title="Template:Piasecki/Vertol aircraft"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Piasecki/Vertol_aircraft" title="Template talk:Piasecki/Vertol aircraft"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Piasecki/Vertol_aircraft" title="Special:EditPage/Template:Piasecki/Vertol aircraft"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Piasecki_Helicopter/Vertol/Piasecki_Aircraft" style="font-size:114%;margin:0 4em"><a href="/wiki/Piasecki_Helicopter" title="Piasecki Helicopter">Piasecki Helicopter/Vertol</a>/<a href="/wiki/Piasecki_Aircraft" title="Piasecki Aircraft">Piasecki Aircraft</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Piasecki/Vertol helicopters</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Piasecki_PV-2" title="Piasecki PV-2">PV-2</a></li> <li><a href="/wiki/Piasecki_HRP_Rescuer" title="Piasecki HRP Rescuer">PV-3/HRP Rescuer</a></li> <li><a class="mw-selflink selflink">PV-14 Retriever</a></li> <li><a href="/wiki/Piasecki_H-16_Transporter" title="Piasecki H-16 Transporter">PV-15 Transporter</a></li> <li><a href="/wiki/Piasecki_HRP_Rescuer" title="Piasecki HRP Rescuer">PV-17 Rescuer</a></li> <li><a href="/wiki/Piasecki_H-16_Transporter" title="Piasecki H-16 Transporter">H-16 Transporter </a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">H-21</a></li> <li><a class="mw-selflink selflink">H-25/HUP Retriever</a></li> <li><a href="/wiki/Vertol_VZ-2" title="Vertol VZ-2">VZ-2</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Piasecki Aircraft</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Platt-LePage_XR-1" title="Platt-LePage XR-1">PA-2B</a></li> <li><a href="/wiki/Piasecki_16H_Pathfinder" title="Piasecki 16H Pathfinder">16H Pathfinder</a></li> <li><a href="/w/index.php?title=Piasecki_PA-39&action=edit&redlink=1" class="new" title="Piasecki PA-39 (page does not exist)">PA-39</a></li> <li><a href="/wiki/Piasecki_VZ-8_Airgeep" title="Piasecki VZ-8 Airgeep">VZ-8/PA-59 Airgeep</a></li> <li><a href="/wiki/Piasecki_PA-97_Helistat" title="Piasecki PA-97 Helistat">PA-97</a></li> <li><a href="/wiki/Piasecki_X-49_SpeedHawk" title="Piasecki X-49 SpeedHawk">X-49</a></li> <li><a href="/w/index.php?title=Piasecki_PA-890&action=edit&redlink=1" class="new" title="Piasecki PA-890 (page does not exist)">PA-890</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="United_States_helicopter_designations,_Army/Air_Force_and_Tri-Service_systems" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:US_helicopters" title="Template:US helicopters"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:US_helicopters" title="Template talk:US helicopters"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:US_helicopters" title="Special:EditPage/Template:US helicopters"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="United_States_helicopter_designations,_Army/Air_Force_and_Tri-Service_systems" style="font-size:114%;margin:0 4em">United States <a href="/wiki/Helicopter" title="Helicopter">helicopter</a> designations, Army/Air Force and <a href="/wiki/1962_United_States_Tri-Service_aircraft_designation_system" title="1962 United States Tri-Service aircraft designation system">Tri-Service</a> systems</div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div>Numerical sequence used by USAAC/USAAF/USAF 1941–present; <a href="/wiki/United_States_Army" title="United States Army">U.S. Army</a> 1948–1956 and 1962–present; <a href="/wiki/United_States_Navy" title="United States Navy">U.S. Navy</a> 1962–present</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Army/Air Force sequence<br />(1941–1962)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Prefix R-, 1941–1948</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Platt-LePage_XR-1" title="Platt-LePage XR-1">R-1</a></li> <li><a href="/wiki/Kellett_KD-1" title="Kellett KD-1">R-2</a></li> <li><a href="/wiki/Kellett_KD-1" title="Kellett KD-1">R-3</a></li> <li><a href="/wiki/Sikorsky_R-4" title="Sikorsky R-4">R-4</a></li> <li><a href="/wiki/Sikorsky_H-5" title="Sikorsky H-5">R-5</a></li> <li><a href="/wiki/Sikorsky_R-6" title="Sikorsky R-6">R-6</a></li> <li><a href="/wiki/Sikorsky_R-6" title="Sikorsky R-6">R-7</a></li> <li><a href="/wiki/Kellett_XR-8" title="Kellett XR-8">R-8</a></li> <li><a href="/wiki/Firestone_XR-9" title="Firestone XR-9">R-9</a></li> <li><a href="/wiki/Kellett_XR-10" title="Kellett XR-10">R-10</a></li> <li><a href="/wiki/Rotorcraft_XR-11" title="Rotorcraft XR-11">R-11</a></li> <li><a href="/wiki/Bell_H-12" title="Bell H-12">R-12</a></li> <li><a href="/wiki/Bell_H-13_Sioux" title="Bell H-13 Sioux">R-13</a></li> <li><a href="/wiki/Firestone_XR-14" title="Firestone XR-14">R-14</a></li> <li><a href="/wiki/Bell_XH-15" title="Bell XH-15">R-15</a></li> <li><a href="/wiki/Piasecki_H-16_Transporter" title="Piasecki H-16 Transporter">R-16</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Prefix H-, 1948–1962</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sikorsky_H-5" title="Sikorsky H-5">H-5</a></li> <li><a href="/wiki/Sikorsky_R-6" title="Sikorsky R-6">H-6</a></li> <li><a href="/wiki/Firestone_XR-9" title="Firestone XR-9">H-9</a></li> <li><a href="/wiki/Kellett_XR-10" title="Kellett XR-10">H-10</a></li> <li><a href="/wiki/Rotorcraft_XR-11" title="Rotorcraft XR-11">H-11</a></li> <li><a href="/wiki/Bell_H-12" title="Bell H-12">H-12</a></li> <li><a href="/wiki/Bell_H-13_Sioux" title="Bell H-13 Sioux">H-13</a> <ul><li><a href="/wiki/Bell_47J_Ranger" title="Bell 47J Ranger">H-13J</a></li></ul></li> <li><a href="/wiki/Bell_XH-15" title="Bell XH-15">H-15</a></li> <li><a href="/wiki/Piasecki_H-16_Transporter" title="Piasecki H-16 Transporter">H-16</a></li> <li><a href="/wiki/Hughes_XH-17" title="Hughes XH-17">H-17</a></li> <li><a href="/wiki/Sikorsky_S-52" title="Sikorsky S-52">H-18</a></li> <li><a href="/wiki/Sikorsky_H-19_Chickasaw" title="Sikorsky H-19 Chickasaw">H-19</a></li> <li><a href="/wiki/McDonnell_XH-20_Little_Henry" title="McDonnell XH-20 Little Henry">H-20</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">H-21</a></li> <li><a href="/wiki/Kaman_K-225" title="Kaman K-225">H-22</a></li> <li><a href="/wiki/Hiller_OH-23_Raven" title="Hiller OH-23 Raven">H-23</a></li> <li><a href="/wiki/Seibel_S-4" title="Seibel S-4">H-24</a></li> <li><a class="mw-selflink selflink">H-25</a></li> <li><a href="/wiki/American_Helicopter_XH-26_Jet_Jeep" title="American Helicopter XH-26 Jet Jeep">H-26</a></li> <li><a href="/wiki/Piasecki_H-16_Transporter" title="Piasecki H-16 Transporter">H-27</a></li> <li><a href="/wiki/Hughes_XH-17" title="Hughes XH-17">H-28</a></li> <li><a href="/wiki/McDonnell_XH-20_Little_Henry" title="McDonnell XH-20 Little Henry">H-29</a></li> <li><a href="/wiki/McCulloch_MC-4" title="McCulloch MC-4">H-30</a></li> <li><a href="/wiki/Doman_LZ-5" title="Doman LZ-5">H-31</a></li> <li><a href="/wiki/Hiller_YH-32_Hornet" title="Hiller YH-32 Hornet">H-32</a></li> <li><a href="/wiki/Bell_XV-3" title="Bell XV-3">H-33</a></li> <li><a href="/wiki/Sikorsky_H-34" title="Sikorsky H-34">H-34</a></li> <li><a href="/wiki/McDonnell_XV-1" title="McDonnell XV-1">H-35</a></li> <li><span class="tmp-color" style="color:grey">H-36</span><sup><small>1</small></sup></li> <li><a href="/wiki/Sikorsky_CH-37_Mojave" title="Sikorsky CH-37 Mojave">H-37</a></li> <li><span class="tmp-color" style="color:grey">H-38</span><sup><small>1</small></sup></li> <li><a href="/wiki/Sikorsky_XH-39" title="Sikorsky XH-39">H-39</a></li> <li><a href="/wiki/Bell_UH-1_Iroquois" title="Bell UH-1 Iroquois">H-40</a></li> <li><a href="/wiki/Cessna_CH-1_Skyhook" title="Cessna CH-1 Skyhook">H-41</a></li> <li><a href="/wiki/Hughes_TH-55_Osage" title="Hughes TH-55 Osage">H-42</a></li> <li><a href="/wiki/Kaman_HH-43_Huskie" title="Kaman HH-43 Huskie">H-43</a></li> <li><span class="tmp-color" style="color:grey">H-44</span><sup><small>1</small></sup></li> <li><span class="tmp-color" style="color:grey">H-45</span><sup><small>1</small></sup></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/1962_United_States_Tri-Service_aircraft_designation_system" title="1962 United States Tri-Service aircraft designation system">Tri-Service sequence</a><br />(1962–present)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">1962 redesignations</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bell_H-13_Sioux" title="Bell H-13 Sioux">H-13</a> <ul><li><a href="/wiki/Bell_201" title="Bell 201">H-13F</a></li> <li><a href="/wiki/Bell_47J_Ranger" title="Bell 47J Ranger">H-13J</a></li></ul></li> <li><a href="/wiki/Sikorsky_H-19_Chickasaw" title="Sikorsky H-19 Chickasaw">H-19</a></li> <li><a href="/wiki/Piasecki_H-21" title="Piasecki H-21">H-21</a></li> <li><a href="/wiki/Hiller_OH-23_Raven" title="Hiller OH-23 Raven">H-23</a></li> <li><a class="mw-selflink selflink">H-25</a></li> <li><a href="/wiki/Sikorsky_H-34" title="Sikorsky H-34">H-34</a></li> <li><a href="/wiki/Sikorsky_CH-37_Mojave" title="Sikorsky CH-37 Mojave">H-37</a></li> <li><a href="/wiki/Kaman_HH-43_Huskie" title="Kaman HH-43 Huskie">H-43</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">New designations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Boeing_Vertol_CH-46_Sea_Knight" title="Boeing Vertol CH-46 Sea Knight">H-46</a></li> <li><a href="/wiki/Boeing_CH-47_Chinook" title="Boeing CH-47 Chinook">H-47</a></li> <li><a href="/wiki/Bell_UH-1_Iroquois" title="Bell UH-1 Iroquois">H-48</a></li> <li><a href="/wiki/Boeing_Vertol_CH-46_Sea_Knight" title="Boeing Vertol CH-46 Sea Knight">H-49</a></li> <li><a href="/wiki/Gyrodyne_QH-50_DASH" title="Gyrodyne QH-50 DASH">H-50</a></li> <li><a href="/wiki/Lockheed_XH-51" title="Lockheed XH-51">H-51</a></li> <li><a href="/wiki/Sikorsky_HH-52_Seaguard" title="Sikorsky HH-52 Seaguard">H-52</a></li> <li>H-53 <ul><li><a href="/wiki/Sikorsky_CH-53_Sea_Stallion" title="Sikorsky CH-53 Sea Stallion">CH-53</a>/<a href="/wiki/Sikorsky_CH-53E_Super_Stallion" title="Sikorsky CH-53E Super Stallion">E</a>/<a href="/wiki/Sikorsky_CH-53K_King_Stallion" title="Sikorsky CH-53K King Stallion">K</a></li> <li><a href="/wiki/Sikorsky_MH-53" title="Sikorsky MH-53">HH-53/MH-53</a></li></ul></li> <li><a href="/wiki/Sikorsky_CH-54_Tarhe" title="Sikorsky CH-54 Tarhe">H-54</a></li> <li><a href="/wiki/Hughes_TH-55_Osage" title="Hughes TH-55 Osage">H-55</a></li> <li><a href="/wiki/Lockheed_AH-56_Cheyenne" title="Lockheed AH-56 Cheyenne">H-56</a></li> <li><a href="/wiki/Bell_206" title="Bell 206">H-57</a></li> <li><a href="/wiki/Bell_OH-58_Kiowa" title="Bell OH-58 Kiowa">H-58</a></li> <li><a href="/wiki/Sikorsky_S-69" title="Sikorsky S-69">H-59</a></li> <li>H-60 <ul><li><a href="/wiki/Sikorsky_UH-60_Black_Hawk" title="Sikorsky UH-60 Black Hawk">UH-60</a></li> <li><a href="/wiki/Sikorsky_SH-60_Seahawk" title="Sikorsky SH-60 Seahawk">SH-60</a></li> <li><a href="/wiki/Sikorsky_HH-60_Pave_Hawk" title="Sikorsky HH-60 Pave Hawk">HH-60</a></li> <li><a href="/wiki/Sikorsky_MH-60_Jayhawk" title="Sikorsky MH-60 Jayhawk">MH-60</a></li></ul></li> <li><a href="/wiki/Boeing_Vertol_YUH-61" title="Boeing Vertol YUH-61">H-61</a></li> <li><a href="/wiki/Boeing_Vertol_XCH-62" title="Boeing Vertol XCH-62">H-62</a></li> <li><a href="/wiki/Bell_YAH-63" title="Bell YAH-63">H-63</a></li> <li><a href="/wiki/Boeing_AH-64_Apache" title="Boeing AH-64 Apache">H-64</a></li> <li><a href="/wiki/Eurocopter_MH-65_Dolphin" title="Eurocopter MH-65 Dolphin">H-65</a></li> <li><a href="/wiki/Boeing%E2%80%93Sikorsky_RAH-66_Comanche" title="Boeing–Sikorsky RAH-66 Comanche">H-66</a></li> <li><a href="/wiki/Bell_206" title="Bell 206">H-67</a></li> <li><a href="/wiki/AgustaWestland_AW109" title="AgustaWestland AW109">H-68</a></li> <li><span class="tmp-color" style="color:grey">H-69</span><sup><small>1</small></sup></li> <li><a href="/wiki/Bell_ARH-70_Arapaho" title="Bell ARH-70 Arapaho">H-70</a></li> <li><a href="/wiki/Lockheed_Martin_VH-71_Kestrel" title="Lockheed Martin VH-71 Kestrel">H-71</a></li> <li><a href="/wiki/Eurocopter_UH-72_Lakota" title="Eurocopter UH-72 Lakota">H-72</a></li> <li><a href="/wiki/AgustaWestland_AW119_Koala" title="AgustaWestland AW119 Koala">H-73</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Alternate sequence</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bell_Huey_family" title="Bell Huey family">H-1</a> <ul><li><a href="/wiki/Bell_AH-1_Cobra" title="Bell AH-1 Cobra">AH-1</a>/<a href="/wiki/Bell_AH-1_SuperCobra" title="Bell AH-1 SuperCobra">J/T/W</a>/<a href="/wiki/Bell_AH-1Z_Viper" title="Bell AH-1Z Viper">Z</a></li> <li><a href="/wiki/Bell_UH-1_Iroquois" title="Bell UH-1 Iroquois">UH-1</a>/<a href="/wiki/Bell_UH-1N_Twin_Huey" title="Bell UH-1N Twin Huey">N</a>/<a href="/wiki/Bell_UH-1Y_Venom" title="Bell UH-1Y Venom">Y</a></li></ul></li> <li><a href="/wiki/Kaman_SH-2_Seasprite" title="Kaman SH-2 Seasprite">H-2</a> <ul><li><a href="/wiki/Kaman_SH-2G_Super_Seasprite" title="Kaman SH-2G Super Seasprite">G</a></li></ul></li> <li>H-3 <ul><li><a href="/wiki/Sikorsky_S-61R" title="Sikorsky S-61R">CH-3/HH-3</a></li> <li><a href="/wiki/Sikorsky_SH-3_Sea_King" title="Sikorsky SH-3 Sea King">SH-3</a></li></ul></li> <li><a href="/wiki/Bell_YOH-4" title="Bell YOH-4">H-4</a></li> <li><a href="/wiki/Fairchild_Hiller_FH-1100" title="Fairchild Hiller FH-1100">H-5</a></li> <li>H-6 <ul><li><a href="/wiki/Boeing_AH-6" title="Boeing AH-6">AH-6</a></li> <li><a href="/wiki/MD_Helicopters_MH-6_Little_Bird" title="MD Helicopters MH-6 Little Bird">MH-6</a></li> <li><a href="/wiki/Hughes_OH-6_Cayuse" title="Hughes OH-6 Cayuse">OH-6</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Non-sequential</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/MD_Helicopters_MD_Explorer" title="MD Helicopters MD Explorer">H-90</a></li> <li><a href="/wiki/Sikorsky_S-92" title="Sikorsky S-92">H-92</a> <ul><li><a href="/wiki/Sikorsky_VH-92_Patriot" title="Sikorsky VH-92 Patriot">CH-92/VH-92</a></li></ul></li> <li><a href="/wiki/Boeing_MH-139_Grey_Wolf" title="Boeing MH-139 Grey Wolf">H-139</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><sup>1</sup> Not assigned</div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="USN_helicopter_designations_pre-1962" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:USN_helicopters" title="Template:USN helicopters"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:USN_helicopters" title="Template talk:USN helicopters"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:USN_helicopters" title="Special:EditPage/Template:USN helicopters"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="USN_helicopter_designations_pre-1962" style="font-size:114%;margin:0 4em"><a href="/wiki/United_States_Navy" title="United States Navy">USN</a> helicopter designations pre-1962</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Anti-submarine</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Bell_Aircraft" title="Bell Aircraft">Bell</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bell_HSL" title="Bell HSL">HSL</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Sikorsky_Aircraft" title="Sikorsky Aircraft">Sikorsky</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sikorsky_H-34" title="Sikorsky H-34">HSS-1</a></li> <li><a href="/wiki/Sikorsky_SH-3_Sea_King" title="Sikorsky SH-3 Sea King">HSS-2</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Crane</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="McDonnell" scope="row" class="navbox-group" style="width:14em"><a href="/wiki/McDonnell_Aircraft" class="mw-redirect" title="McDonnell Aircraft">McDonnell</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/McDonnell_HCH" class="mw-redirect" title="McDonnell HCH">HCH</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Observation</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/w/index.php?title=Convertawings&action=edit&redlink=1" class="new" title="Convertawings (page does not exist)">Convertawings</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Convertawings_Model_C_Quadrotor&action=edit&redlink=1" class="new" title="Convertawings Model C Quadrotor (page does not exist)">HOC</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Hiller_Aircraft" title="Hiller Aircraft">Hiller</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hiller_YH-32_Hornet" title="Hiller YH-32 Hornet">HOE</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Gyrodyne_Company_of_America" title="Gyrodyne Company of America">Gyrodyne</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gyrodyne_RON_Rotorcycle" title="Gyrodyne RON Rotorcycle">HOG</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Kaman_Aircraft" class="mw-redirect" title="Kaman Aircraft">Kaman</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Kaman_HH-43_Huskie" title="Kaman HH-43 Huskie">HOK</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Sikorsky_Aircraft" title="Sikorsky Aircraft">Sikorsky</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sikorsky_R-6" title="Sikorsky R-6">HOS</a></li> <li><a href="/wiki/Sikorsky_H-5" title="Sikorsky H-5">HO2S</a></li> <li><a href="/wiki/Sikorsky_H-5" title="Sikorsky H-5">HO3S</a></li> <li><a href="/wiki/Sikorsky_H-19_Chickasaw" title="Sikorsky H-19 Chickasaw">HO4S</a></li> <li><a href="/wiki/Sikorsky_S-52" title="Sikorsky S-52">HO5S</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Trainer pre-1948</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Sikorsky" scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Sikorsky_Aircraft" title="Sikorsky Aircraft">Sikorsky</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sikorsky_R-4" title="Sikorsky R-4">HNS</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Trainer 1948-1962</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Hiller_Aircraft" title="Hiller Aircraft">Hiller</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hiller_OH-23_Raven" title="Hiller OH-23 Raven">HTE</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Kaman_Aircraft" class="mw-redirect" title="Kaman Aircraft">Kaman</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Kaman_HH-43_Huskie" title="Kaman HH-43 Huskie">HTK</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Bell_Aircraft" title="Bell Aircraft">Bell</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bell_H-13_Sioux" title="Bell H-13 Sioux">HTL</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Transport 1944-1962</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Boeing_Rotorcraft_Systems" title="Boeing Rotorcraft Systems">Boeing Vertol</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Boeing_Vertol_CH-46_Sea_Knight" title="Boeing Vertol CH-46 Sea Knight">HRB</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/McDonnell_Aircraft" class="mw-redirect" title="McDonnell Aircraft">McDonnell</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/McDonnell_HRH" title="McDonnell HRH">HRH</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Piasecki_Helicopter" title="Piasecki Helicopter">Piasecki</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Piasecki_HRP_Rescuer" title="Piasecki HRP Rescuer">HRP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Sikorsky_Aircraft" title="Sikorsky Aircraft">Sikorsky</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sikorsky_H-19_Chickasaw" title="Sikorsky H-19 Chickasaw">HRS</a></li> <li><a href="/wiki/Sikorsky_CH-37_Mojave" title="Sikorsky CH-37 Mojave">HR2S</a></li> <li><a href="/wiki/Sikorsky_S-61R" title="Sikorsky S-61R">HR3S</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Utility pre-1949</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/McDonnell_Aircraft" class="mw-redirect" title="McDonnell Aircraft">McDonnell</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/McDonnell_XHJH_Whirlaway" title="McDonnell XHJH Whirlaway">HJD</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/McDonnell_Aircraft" class="mw-redirect" title="McDonnell Aircraft">McDonnell</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/McDonnell_XHJH_Whirlaway" title="McDonnell XHJH Whirlaway">HJH</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Piasecki_Helicopter" title="Piasecki Helicopter">Piasecki</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">HJP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Sikorsky_Aircraft" title="Sikorsky Aircraft">Sikorsky</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sikorsky_XHJS" title="Sikorsky XHJS">HJS</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helicopter, Utility 1950-1962</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Kaman_Aircraft" class="mw-redirect" title="Kaman Aircraft">Kaman</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Kaman_HH-43_Huskie" title="Kaman HH-43 Huskie">HUK</a></li> <li><a href="/wiki/Kaman_SH-2_Seasprite" title="Kaman SH-2 Seasprite">HU2K</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Bell_Aircraft" title="Bell Aircraft">Bell</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bell_47J_Ranger" title="Bell 47J Ranger">HUL</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/McCulloch_Aircraft_Corporation" title="McCulloch Aircraft Corporation">McCulloch</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/McCulloch_MC-4" title="McCulloch MC-4">HUM</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Piasecki_Helicopter" title="Piasecki Helicopter">Piasecki</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">HUP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:14em"><a href="/wiki/Sikorsky_Aircraft" title="Sikorsky Aircraft">Sikorsky</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sikorsky_H-34" title="Sikorsky H-34">HUS</a></li> <li><a href="/wiki/Sikorsky_H-34" title="Sikorsky H-34">HU2S</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" 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