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class="firstHeading mw-first-heading"><span class="mw-page-title-main">Ho-155 cannon</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. 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data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"Ho-155" redirects here. For the isotope of holmium (Ho-155 or <sup>155</sup>Ho), see <a href="/wiki/Holmium-155" class="mw-redirect" title="Holmium-155">Holmium-155</a>.</div> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Aircraft cannon</div><style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vcard" style="width:25.5em;border-spacing:2px;"><tbody><tr><th colspan="2" class="infobox-above hproduct" style="background-color:#C3D6EF;color:inherit;text-align:center;vertical-align:middle;font-size:110%;"><span class="fn org"> Ho-155 cannon </span></th></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em">Type</th><td class="infobox-data">Aircraft cannon</td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em">Place of origin</th><td class="infobox-data">Imperial Japanese army</td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#C3D6EF;color:inherit;text-align:center;vertical-align:middle;font-size:110%;">Service history</th></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em">Wars</th><td class="infobox-data"><a href="/wiki/World_War_II" title="World War II">World War II</a></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#C3D6EF;color:inherit;text-align:center;vertical-align:middle;font-size:110%;">Specifications</th></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em">Mass</th><td class="infobox-data"><b>Ho-155-I</b>: 50 <a href="/wiki/Kilogram" title="Kilogram">kg</a> (110 <a href="/wiki/Pound_(mass)" title="Pound (mass)">lb</a> 4 <a href="/wiki/Ounce" title="Ounce">oz</a>)<br /><b>Ho-155-II</b>: 44 <a href="/wiki/Kilogram" title="Kilogram">kg</a> (97 <a href="/wiki/Pound_(mass)" title="Pound (mass)">lb</a> 0 <a href="/wiki/Ounce" title="Ounce">oz</a>)</td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em">Length</th><td class="infobox-data"><b>Ho-155-I</b>: 1,750 mm (69 in)<br /><b>Ho-155-II</b>: 1,510 mm (59 in)</td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em"><a href="/wiki/Gun_barrel" title="Gun barrel">Barrel</a> length</th><td class="infobox-data"><b>Ho-155-I</b>: 1,140 mm (45 in)<br /><b>Ho-155-II</b>: 980 mm (39 in)</td></tr><tr><td colspan="2" class="infobox-full-data"><hr /></td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em"><a href="/wiki/Cartridge_(firearms)" title="Cartridge (firearms)">Cartridge</a></th><td class="infobox-data">30 x 114mm (235 g)</td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em"><a href="/wiki/Caliber" title="Caliber">Calibre</a></th><td class="infobox-data">30 mm (1.2 in)<sup id="cite_ref-Bradstreet_1-0" class="reference"><a href="#cite_note-Bradstreet-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em"><a href="/wiki/Action_(firearms)" title="Action (firearms)">Action</a></th><td class="infobox-data"><a href="/wiki/Recoil_operation" title="Recoil operation">Short recoil-operated</a></td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em"><a href="/wiki/Rate_of_fire" title="Rate of fire">Rate of fire</a></th><td class="infobox-data">450-500 rounds/min</td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em"><a href="/wiki/Muzzle_velocity" title="Muzzle velocity">Muzzle velocity</a></th><td class="infobox-data">715 m/s (2,350 ft/s)</td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em">Effective firing range</th><td class="infobox-data">900 m</td></tr><tr><th scope="row" class="infobox-label" style="padding-right:1em">Feed system</th><td class="infobox-data"><a href="/wiki/Belt_(firearms)" title="Belt (firearms)">Belt</a></td></tr></tbody></table> <p>The <b>30 mm Ho-155 cannon</b> was a Japanese aircraft <a href="/wiki/Autocannon" title="Autocannon">autocannon</a> used during <a href="/wiki/World_War_II" title="World War II">World War II</a>, often mistakenly called with the Ho-105 or Ho-151. A lighter and more compact Ho-155-II was designed towards the end of the war.<sup id="cite_ref-pwen_2-0" class="reference"><a href="#cite_note-pwen-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Development">Development</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ho-155_cannon&action=edit&section=1" title="Edit section: 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:Nakajima_Ki-201_Karyu_profile_line_drawing.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Nakajima_Ki-201_Karyu_profile_line_drawing.png/220px-Nakajima_Ki-201_Karyu_profile_line_drawing.png" decoding="async" width="220" height="72" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Nakajima_Ki-201_Karyu_profile_line_drawing.png/330px-Nakajima_Ki-201_Karyu_profile_line_drawing.png 1.5x, //upload.wikimedia.org/wikipedia/commons/5/5d/Nakajima_Ki-201_Karyu_profile_line_drawing.png 2x" data-file-width="350" data-file-height="114" /></a><figcaption>Had the war continued longer the Ho-155-II would most likely have seen service on the jet-powered Karyu <a href="/wiki/Nakajima_Ki-201" title="Nakajima Ki-201">Ki-201</a></figcaption></figure> <p>The Ho-155-I was first began development in 1942 as a scaled-up and modified version of the 20mm <a href="/wiki/Ho-5_cannon" title="Ho-5 cannon">Ho-5 cannon</a>,<sup id="cite_ref-Bradstreet_1-1" class="reference"><a href="#cite_note-Bradstreet-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> itself a scaled-up Model 1921 aircraft .50-inch <a href="/wiki/M2_Browning" title="M2 Browning">Browning machine gun</a>. In 1943-44 began development of the Ho-155-I and in late 1944 began the development and production of the Ho-155-II<sup id="cite_ref-Bradstreet_1-2" class="reference"><a href="#cite_note-Bradstreet-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> for fit into tighter wing bays of fighter planes such as the <a href="/wiki/Nakajima_Ki-84" title="Nakajima Ki-84">Ki-84-Ic</a>,<sup id="cite_ref-Bradstreet_1-3" class="reference"><a href="#cite_note-Bradstreet-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Kawasaki_Ki-102" title="Kawasaki Ki-102">Ki-102</a> and on the project design of the jet-powered <a href="/wiki/Nakajima_Ki-201" title="Nakajima Ki-201">Ki-201</a>.<sup id="cite_ref-dragon_3-0" class="reference"><a href="#cite_note-dragon-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Unknown_service">Unknown service</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ho-155_cannon&action=edit&section=2" title="Edit section: Unknown service"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Simultaneously the Ho-155-I and Ho-155-II were produced in <a href="/wiki/Nagoya" title="Nagoya">Nagoya</a> by the <a href="/wiki/Nagoya_Arsenal" title="Nagoya Arsenal">Nagoya Army Arsenal</a>, but as the war was prolonged leading to shortages of materials it is not known how many were eventually produced or how many actually saw service. However it became an example of ingenuity and design from the simple basic design of the Browning machine gun. </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=Ho-155_cannon&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-Bradstreet-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Bradstreet_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Bradstreet_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Bradstreet_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Bradstreet_1-3"><sup><i><b>d</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 .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFBradstreet" class="citation web cs1">Bradstreet, T.E. <a rel="nofollow" class="external text" href="http://www.j-aircraft.com/research/30_mm_ho155_browning.htm">"The 30 mm Ho-155 Browning"</a>. <i>www.j-aircraft.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">1 July</span> 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.j-aircraft.com&rft.atitle=The+30+mm+Ho-155+Browning&rft.aulast=Bradstreet&rft.aufirst=T.E.&rft_id=http%3A%2F%2Fwww.j-aircraft.com%2Fresearch%2F30_mm_ho155_browning.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHo-155+cannon" class="Z3988"></span></span> </li> <li id="cite_note-pwen-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-pwen_2-0">^</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://pwencycl.kgbudge.com/J/a/Japanese_30mm_Ho-105_gun.html">"Japanese 30mm Ho-155 Cannon"</a>. pwencycl.kgbudge.com<span class="reference-accessdate">. Retrieved <span class="nowrap">20 March</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=Japanese+30mm+Ho-155+Cannon&rft.pub=pwencycl.kgbudge.com&rft_id=http%3A%2F%2Fpwencycl.kgbudge.com%2FJ%2Fa%2FJapanese_30mm_Ho-105_gun.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHo-155+cannon" class="Z3988"></span></span> </li> <li id="cite_note-dragon-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-dragon_3-0">^</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="https://web.archive.org/web/20070928055441/http://www.dragonsoffire.com/aircraft-jarmy.htm">"JAPANESE ARMY AIRCRAFT WEAPONS"</a>. www.dragonsoffire.com. Archived from <a rel="nofollow" class="external text" href="http://www.dragonsoffire.com/aircraft-jarmy.htm">the original</a> on 28 September 2007<span class="reference-accessdate">. Retrieved <span class="nowrap">20 March</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=JAPANESE+ARMY+AIRCRAFT+WEAPONS&rft.pub=www.dragonsoffire.com&rft_id=http%3A%2F%2Fwww.dragonsoffire.com%2Faircraft-jarmy.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHo-155+cannon" class="Z3988"></span></span> </li> </ol></div> <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=Ho-155_cannon&action=edit&section=4" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Gustin Emmanuel, <a rel="nofollow" class="external text" href="http://users.skynet.be/Emmanuel.Gustin/fgun/fgun-pe.html">The WWII Fighter Gun Debate: Gun Tables</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20190413015202/http://users.skynet.be/Emmanuel.Gustin/fgun/fgun-pe.html">Archived</a> 2019-04-13 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> (1999)</li> <li>Anthony G. Williams, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20141109213507/http://www.quarryhs.co.uk/ammotable4.htm">30 MM CALIBRE CARTRIDGES</a></li></ul>    </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" href="https://en.wikipedia.org/w/index.php?title=Ho-155_cannon&oldid=1169040244">https://en.wikipedia.org/w/index.php?title=Ho-155_cannon&oldid=1169040244</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:30_mm_artillery" title="Category:30 mm artillery">30 mm artillery</a></li><li><a href="/wiki/Category:Autocannon" title="Category:Autocannon">Autocannon</a></li><li><a href="/wiki/Category:Aircraft_guns" title="Category:Aircraft guns">Aircraft guns</a></li><li><a href="/wiki/Category:World_War_II_weapons_of_Japan" title="Category:World War II weapons of Japan">World War II weapons of Japan</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:Webarchive_template_wayback_links" title="Category:Webarchive template wayback links">Webarchive template wayback links</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 6 August 2023, at 17:46<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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