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class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Applications</span> </div> </a> <ul id="toc-Applications-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Engines_on_display" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Engines_on_display"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Engines on display</span> </div> </a> <ul id="toc-Engines_on_display-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Specifications_(D.II)" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Specifications_(D.II)"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Specifications (D.II)</span> </div> </a> <button aria-controls="toc-Specifications_(D.II)-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon 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font-size: 125%;">D.II </th></tr> <tr> <td colspan="2" style="text-align: center;"><span typeof="mw:File"><a href="/wiki/File:Daimler_DII.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Daimler_DII.jpg/300px-Daimler_DII.jpg" decoding="async" width="300" height="313" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Daimler_DII.jpg/450px-Daimler_DII.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Daimler_DII.jpg/600px-Daimler_DII.jpg 2x" data-file-width="637" data-file-height="664" /></a></span> </td></tr> <tr> <td colspan="2" style="border-bottom: 1px solid #aaa;text-align:center;">D II engine at the <a href="/wiki/Deutsches_Technikmuseum_Berlin" class="mw-redirect" title="Deutsches Technikmuseum Berlin">Deutsches Technikmuseum Berlin</a> </td></tr> <tr> <th>Type </th> <td><a href="/wiki/Reciprocating_engine" title="Reciprocating engine">Inline piston engine</a> </td></tr> <tr> <th><span class="nowrap">National origin</span> </th> <td>Germany </td></tr> <tr> <th>Manufacturer </th> <td><a href="/wiki/Mercedes-Benz" title="Mercedes-Benz">Mercedes</a> </td></tr> <tr> <th><span class="nowrap">Developed from</span> </th> <td><a href="/wiki/Mercedes_D.I" title="Mercedes D.I">Mercedes D.I</a> </td></tr> <tr> <th><span class="nowrap">Developed into</span> </th> <td><a href="/wiki/Mercedes_D.III" title="Mercedes D.III">Mercedes D.III</a> </td></tr></tbody></table> <p>The <b>Mercedes D.II</b> was a six-cylinder, <a href="/wiki/SOHC" class="mw-redirect" title="SOHC">SOHC</a> valvetrain liquid-cooled inline <a href="/wiki/Aircraft_engine" title="Aircraft engine">aircraft engine</a> built by <a href="/wiki/Daimler_Motoren_Gesellschaft" title="Daimler Motoren Gesellschaft">Daimler</a> during the early stages of <a href="/wiki/World_War_I" title="World War I">World War I</a>. Producing about 110 to 120 hp, it was at the low-end of the power range of contemporary engines, and was generally outperformed by <a href="/wiki/Rotary_engine" title="Rotary engine">rotaries</a> whose <a href="/wiki/Power-to-weight_ratio" title="Power-to-weight ratio">power-to-weight ratio</a> tended to be much better. It also had stiff competition from the <a href="/wiki/Ferdinand_Porsche" title="Ferdinand Porsche">Ferdinand Porsche</a>-designed 120 hp <a href="/wiki/Austro-Daimler_6" title="Austro-Daimler 6">Austro-Daimler 6</a>. The D.II was produced only briefly as a result, but its design formed the basis for the later <a href="/wiki/Mercedes_D.III" title="Mercedes D.III">Mercedes D.III</a> which saw widespread use throughout the war. </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=Mercedes_D.II&action=edit&section=1" title="Edit section: Design and development"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The D.II was based on the Austro-Daimler to a large degree. Like the Austro-Daimler, it was built up from the <a href="/wiki/Crankcase" title="Crankcase">crankcase</a>, which was milled from two pieces of cast aluminum bolted together at their midline. The cylinders were separately milled from steel and bolted to the top of the crankcase. Steel sleeves were fitted over the cylinders and welded on to form a cooling jacket. Much of this complexity is due to the differential rates of expansion of steel and aluminum, which precluded screwing the cylinders into the crankcase, and the alloys of the era meant that an aluminum cylinder was not possible. Both engines also used a scavenger pump to pump oil out of the crankcase to a separate cylinder, where a second high-pressure pump supplied oil to the engine. This arrangement allowed for a much smaller "sump" on the bottom of the crankcase, reducing the overall size of the engine, although in the case of the D.II it was not nearly as much as the Austro-Daimler. </p><p>Where the D.II differed from the Austro-Daimler was largely in mechanical arrangement. For instance, the D.II featured a single <a href="/wiki/Overhead_cam" class="mw-redirect" title="Overhead cam">overhead cam</a>, powered by a shaft leading up from the <a href="/wiki/Crankshaft" title="Crankshaft">crankshaft</a> at the rear of the engine, whereas the Austro-Daimler had a more conventional valvetrain using pushrods driven from the crankcase. Another unique feature was the ability to shift the camshaft to a half-compression position for starting. The D.II used two carburetors located together on one side of the engine, feeding the cylinders through two manifolds; the Austro-Daimler separated its carburetors to locate them closer to the cylinders they fed. The D.II also used a unique cooling jacket design, with every two cylinders being covered by a single jacket. </p><p>The D.II was introduced in 1914.<sup id="cite_ref-:0_1-0" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It was fairly quickly replaced by the D.III, and ended production around 1916. The D.III was essentially a scaled-up D.II, although it abandoned the paired cooling jackets. </p> <div class="mw-heading mw-heading2"><h2 id="Applications">Applications</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Mercedes_D.II&action=edit&section=2" title="Edit section: Applications"><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:Junkers_J_1_at_D%C3%B6beritz_1915.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/db/Junkers_J_1_at_D%C3%B6beritz_1915.jpg/220px-Junkers_J_1_at_D%C3%B6beritz_1915.jpg" decoding="async" width="220" height="88" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/db/Junkers_J_1_at_D%C3%B6beritz_1915.jpg/330px-Junkers_J_1_at_D%C3%B6beritz_1915.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/db/Junkers_J_1_at_D%C3%B6beritz_1915.jpg/440px-Junkers_J_1_at_D%C3%B6beritz_1915.jpg 2x" data-file-width="4348" data-file-height="1737" /></a><figcaption>D.II-powered <a href="/wiki/Junkers_J_1" title="Junkers J 1">Junkers J 1</a></figcaption></figure> <ul><li><a href="/wiki/Aviatik_B.II" class="mw-redirect" title="Aviatik B.II">Aviatik B.II</a></li> <li><a href="/wiki/Aviatik_C.I" title="Aviatik C.I">Aviatik C.I</a></li> <li><a href="/wiki/Albatros_B.I" title="Albatros B.I">Albatros B.I</a></li> <li><a href="/wiki/Albatros_B.II" title="Albatros B.II">Albatros B.II</a></li> <li><a href="/wiki/DFW_B.I" title="DFW B.I">DFW B.II</a></li> <li><a href="/wiki/Fokker_D.I" title="Fokker D.I">Fokker D.I</a></li> <li><a href="/wiki/Fokker_V.6" title="Fokker V.6">Fokker V 6</a></li> <li><a href="/wiki/Friedrichshafen_FF.29" title="Friedrichshafen FF.29">Friedrichshafen FF.29</a></li> <li><a href="/wiki/Halberstadt_D.II" title="Halberstadt D.II">Halberstadt D.II</a></li> <li><a href="/wiki/Junkers_J_1" title="Junkers J 1">Junkers J 1</a> <i>Blechesel</i></li> <li><a href="/wiki/Zmaj_Fizir_FN" title="Zmaj Fizir FN">Zmaj Fizir FN</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Engines_on_display">Engines on display</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Mercedes_D.II&action=edit&section=3" title="Edit section: Engines on display"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>One surviving example of this engine had been on display at Old Rhinebeck Aerodrome-its crankshaft had sheared, and the engine is rumored to possibly have been brought to <a href="/wiki/New_Zealand" title="New Zealand">New Zealand</a>. </p><p>Deutsche Museum in Munich has one example on display, this is a cutaway model that was created by Daimler <sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Specifications_(D.II)"><span id="Specifications_.28D.II.29"></span>Specifications (D.II)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Mercedes_D.II&action=edit&section=4" title="Edit section: Specifications (D.II)"><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:Daimler_D_II.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/52/Daimler_D_II.jpg/220px-Daimler_D_II.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/52/Daimler_D_II.jpg/330px-Daimler_D_II.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/52/Daimler_D_II.jpg/440px-Daimler_D_II.jpg 2x" data-file-width="2592" data-file-height="1944" /></a><figcaption>Side view</figcaption></figure> <p style="font-size: 90%; margin:0; padding: .2em"><i>Data from</i> <i>Albatros D.I-D.II</i> <sup id="cite_ref-:0_1-1" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></p> <div class="mw-heading mw-heading3"><h3 id="General_characteristics">General characteristics</h3></div> <ul><li><b>Type:</b> 6-cylinder, inline piston engine</li> <li><b><a href="/wiki/Bore_(engine)" title="Bore (engine)">Bore</a>:</b> 125 mm (4.92 in)</li> <li><b><a href="/wiki/Stroke_(engine)" title="Stroke (engine)">Stroke</a>:</b> 150 mm (5.91 in)</li> <li><b><a href="/wiki/Engine_displacement" title="Engine displacement">Displacement</a>:</b> 11.05 L (674.31 cu in)</li> <li><b>Length:</b> 1,650 mm (64.96 in)</li> <li><b>Width:</b> 490 mm (19.29 in)</li> <li><b>Height:</b> 1,072 mm (42.20 in)</li> <li><b><a href="/wiki/Dry_weight" class="mw-redirect" title="Dry weight">Dry weight</a>:</b> 210 kg (463 lb)</li></ul> <div class="mw-heading mw-heading3"><h3 id="Components">Components</h3></div> <ul><li><b><a href="/wiki/Valvetrain" title="Valvetrain">Valvetrain</a>:</b> Single overhead camshaft (SOHC) with two valves per cylinder</li> <li><b>Cooling system:</b> Liquid</li> <li><b><a href="/wiki/Propeller_speed_reduction_unit" title="Propeller speed reduction unit">Reduction gear</a>:</b> Direct drive, left-hand tractor</li></ul> <div class="mw-heading mw-heading3"><h3 id="Performance">Performance</h3></div> <ul><li><b>Power output:</b> 120 hp at 1,400 rpm</li> <li><b><a href="/wiki/Compression_ratio" title="Compression ratio">Compression ratio</a>:</b> 4,5:1</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=Mercedes_D.II&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p> <b>Comparable engines</b> </p> <ul><li><a href="/wiki/Rolls-Royce_Hawk" title="Rolls-Royce Hawk">Rolls-Royce Hawk</a></li></ul> <p><b>Related lists</b> </p> <ul><li><a href="/wiki/List_of_aircraft_engines" title="List of aircraft engines">List of aircraft engines</a></li></ul> <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=Mercedes_D.II&action=edit&section=6" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Notes">Notes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Mercedes_D.II&action=edit&section=7" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <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"><ol class="references"> <li id="cite_note-:0-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_1-1"><sup><i><b>b</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="CITEREFMiller2013" class="citation book cs1">Miller, James F. (2013). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=RpqjCwAAQBAJ&q=mercedes+d.ii+bore&pg=PA21"><i>Albatros D.I-D.II</i></a>. Bloomsbury Publishing. p. 21. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1780966014" title="Special:BookSources/978-1780966014"><bdi>978-1780966014</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Albatros+D.I-D.II&rft.pages=21&rft.pub=Bloomsbury+Publishing&rft.date=2013&rft.isbn=978-1780966014&rft.aulast=Miller&rft.aufirst=James+F.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DRpqjCwAAQBAJ%26q%3Dmercedes%2Bd.ii%2Bbore%26pg%3DPA21&rfr_id=info%3Asid%2Fen.wikipedia.org%3AMercedes+D.II" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">Photograph cited in the Daimler Archives</span> </li> </ol></div></div> <div class="mw-heading mw-heading3"><h3 id="Bibliography">Bibliography</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Mercedes_D.II&action=edit&section=8" title="Edit section: Bibliography"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Gunston, Bill. <i>World Encyclopedia of Aero Engines</i>. Cambridge, England. Patrick Stephens Limited, 1989. <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/1-85260-163-9" title="Special:BookSources/1-85260-163-9">1-85260-163-9</a></li> <li><i>Jane's Fighting Aircraft of World War I</i>. London. Studio Editions Ltd, 1993. <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/1-85170-347-0" title="Special:BookSources/1-85170-347-0">1-85170-347-0</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Mercedes_D.II&action=edit&section=9" title="Edit section: Further reading"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" 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:Mercedes_D.II" class="extiw" title="commons:Category:Mercedes D.II">Mercedes D.II</a></span>.</div></div> </div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDüsing2022" class="citation book cs1">Düsing, Michael (2022). <i>German & Austro-Hungarian Aero Engines of WWI</i>. 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