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<title>Armstrong Siddeley Python</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Armstrong Siddeley Python</span></span>

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<th colspan="2" style="text-align: center; font-size: 125%;">Python

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<td colspan="2" style="border-bottom: 1px solid #aaa;text-align:center;">An Armstrong Siddeley Python during <a href="National_Advisory_Committee_for_Aeronautics" title="National Advisory Committee for Aeronautics">NACA</a> wind tunnel testing in 1949

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<th>Type

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<td><a href="Turboprop" title="Turboprop">Turboprop</a>

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<th><span class="nowrap">National origin</span>

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<td>United Kingdom

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<th>Manufacturer

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<td><a href="Armstrong_Siddeley" title="Armstrong Siddeley">Armstrong Siddeley</a>

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<th>First run

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<td>April 1945

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<th><span class="nowrap">Major applications</span>

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<td><a href="Westland_Wyvern" title="Westland Wyvern">Westland Wyvern</a>

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<th><span class="nowrap">Developed from</span>

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<td><a href="Armstrong_Siddeley_ASX" title="Armstrong Siddeley ASX">Armstrong Siddeley ASX</a>

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<p>The <b>Armstrong Siddeley Python</b> is an early British <a href="Turboprop" title="Turboprop">turboprop</a> engine that was designed and built by the <a href="Armstrong_Siddeley" title="Armstrong Siddeley">Armstrong Siddeley</a> company in the mid-1940s. Its main use was in the <a href="Westland_Wyvern" title="Westland Wyvern">Westland Wyvern</a>, a <a href="Carrier-based" class="mw-redirect" title="Carrier-based">carrier-based</a> heavy fighter. The prototypes had used the <a href="Rolls-Royce_Eagle_(1944)" title="Rolls-Royce Eagle (1944)">Rolls-Royce Eagle</a> piston engine, but Pythons were used in production aircraft. In this application, the Python was rated at 4,110 <a href="Equivalent_shaft_horsepower" class="mw-redirect" title="Equivalent shaft horsepower">equivalent shaft horsepower</a> (eshp).

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<div class="mw-heading mw-heading2"><h2 id="Design_and_development">Design and development</h2></div>

<p>The design started as an experimental pure-turbojet known as the <a href="Armstrong_Siddeley_ASX" title="Armstrong Siddeley ASX">ASX</a>, which commenced testing in 1943. By this point other engine designs were already entering pre-production, and it seemed there was little need for the ASX in its existing form. The design was then modified by the addition of a reduction gearbox to drive a propeller. The turboprop thus formed was named <b>ASP</b>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading3"><h3 id="Flight_testing">Flight testing</h3></div>

<p>Early flight-testing of the Python was carried out using the <a href="Avro_Lancaster" title="Avro Lancaster">Lancaster B.1 (FE)</a> <i><a href="United_Kingdom_military_aircraft_serials" class="mw-redirect" title="United Kingdom military aircraft serials">TW911</a></i> and the <a href="Avro_Lincoln" title="Avro Lincoln">Lincoln B.2</a> <i>RE339/G</i>: in each aircraft Pythons replaced the two outboard <a href="Rolls-Royce_Merlin" title="Rolls-Royce Merlin">Rolls-Royce Merlins</a>.

</p><p>Lincoln B.2 <i>RF403</i> had two Pythons similarly installed and was used for high-altitude bombing trials at <a href="Woomera%2C_South_Australia" title="Woomera, South Australia">Woomera, South Australia</a>. These trials were principally of the ballistic casings for the <a href="Blue_Danube_(nuclear_weapon)" title="Blue Danube (nuclear weapon)">Blue Danube</a> <a href="Nuclear_weapon" title="Nuclear weapon">atomic weapon</a>: the Lincoln was the only available aircraft that could accommodate the large weapon casing, measuring 62 inches diameter x 24 feet (7.3 m) in length. The Pythons were fitted to increase the <a href="Flight_ceiling" class="mw-redirect" title="Flight ceiling">height</a> from which tests could be carried out. Maximum release height and speed for the first eleven tests was 275 mph and 34,783 ft (10,602 m) with a bombing error of 61 ft.<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>

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<div class="mw-heading mw-heading2"><h2 id="Python_Engine_on_public_display">Python Engine on public display</h2></div>

<p>An Armstrong Siddeley Python is on display at the <a href="East_Midlands_Aeropark" class="mw-redirect" title="East Midlands Aeropark">East Midlands Aeropark</a> Castle Donington.

</p>

<div class="mw-heading mw-heading2"><h2 id="Variants">Variants</h2></div>

<dl><dt>ASP.1 (Python 1)</dt>

<dd>reduction gear ratio 0.127:1</dd>

<dt>ASP.2 (Python 2)</dt>

<dd>reduction gear ratio 0.135:1</dd>

<dt>ASP.3 (Python 3)</dt>

<div class="mw-heading mw-heading2"><h2 id="Applications">Applications</h2></div>

<ul><li><a href="Avro_Lancaster" title="Avro Lancaster">Avro Lancaster</a> - (test only)</li>

<li><a href="Avro_Lincoln" title="Avro Lincoln">Avro Lincoln</a> - (test only)</li>

<li><a href="Westland_Wyvern" title="Westland Wyvern">Westland Wyvern</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="Specifications_(ASP.3)">Specifications (ASP.3)</h2></div>

<p style="font-size: 90%; margin:0; padding: .2em"><i>Data from</i> <i>Flight</i>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></p>

<div class="mw-heading mw-heading4"><h4 id="General_characteristics">General characteristics</h4></div>

<ul><li>Type: <a href="Turboprop" title="Turboprop">Turboprop</a></li>

<li>Length: 123.2 in (313 cm)</li>

<li>Diameter: 54 in (137 cm)</li>

<li>Dry weight: 3,450 lb (1,565 kg)</li></ul>

<div class="mw-heading mw-heading4"><h4 id="Components">Components</h4></div>

<ul><li>Compressor: Axial flow; 14 stages</li>

<li><a href="Combustor" title="Combustor">Combustors</a>: 11 combustion chambers</li>

<li><a href="Turbine" title="Turbine">Turbine</a>: Axial flow; two stages</li></ul>

<div class="mw-heading mw-heading4"><h4 id="Performance">Performance</h4></div>

<ul><li>Maximum power output: 4,110 <a href="Eshp" class="mw-redirect" title="Eshp">eshp</a> (3,065 kW) at sea level at 8,000 rpm, including 1,180 lbf (535 <a href="Kilopond" class="mw-redirect" title="Kilopond">kp</a>) exhaust thrust</li>

<li><a href="Overall_pressure_ratio" title="Overall pressure ratio">Overall pressure ratio</a>: 5.35:1</li>

<li><a href="Thrust_specific_fuel_consumption" class="mw-redirect" title="Thrust specific fuel consumption">Specific fuel consumption</a>: 0.805 lb/(h eshp)</li>

<li><a href="Power-to-weight_ratio" title="Power-to-weight ratio">Power-to-weight ratio</a>: 1.2:1</li></ul>

<p>

<b>Related development</b>

</p>

<ul><li><a href="Armstrong_Siddeley_ASX" title="Armstrong Siddeley ASX">Armstrong Siddeley ASX</a></li></ul>

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<b>Related lists</b>

</p>

<ul><li><a href="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></div>

<div class="mw-heading mw-heading3"><h3 id="Notes">Notes</h3></div>

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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">Gunston 1998, p.19.</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">The National Archives, London, file ES 1/44 E4C Appendix 3 page 1.</span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.flightglobal.com/pdfarchive/view/1954/1954%20-%200979.html">Flight Global Archive - 1954</a> www.flightglobal.com. Retrieved: 3 November 2008</span>

</li>

</ol></div></div>

<div class="mw-heading mw-heading3"><h3 id="Bibliography">Bibliography</h3></div>

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</style><cite id="CITEREFGunston1998" class="citation book cs1">Gunston, Bill (1998). <i>World encyclopaedia of aero engines : all major aircraft power plants, from the Wright brothers to the present day</i> (4th ed.). Sparkford, Nr Yeovil, Somerset, [England]: P. Stephens. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-1852605971</bdi>.</cite></li>

<li><cite id="CITEREFGunston1989" class="citation book cs1">Gunston, Bill (1989). <i>World Encyclopaedia of Aero Engines</i> (2nd ed.). Cambridge, England: Patrick Stephens Limited. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-1-85260-163-8</bdi>.</cite></li>

<li><cite id="CITEREFBridgman1947" class="citation book cs1">Bridgman, Leonard, ed. (1947). <i>Jane's all the World's Aircraft 1947</i>. London: Sampson Low, Marston & Co. pp. <span class="nowrap">4d –</span> <span class="nowrap">5d</span>.</cite></li></ul>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

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<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:Armstrong_Siddeley_Python" class="extiw external" title="commons:Category:Armstrong Siddeley Python">Armstrong Siddeley Python</a></span>.</div></div>

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<ul><li><a rel="nofollow" class="external text" href="http://1000aircraftphotos.com/Contributions/Braas/9314.htm">Image of the Python-engined Lancaster B.Mk.I (FE) <i>TW911</i></a></li>

<li><a rel="nofollow" class="external text" href="http://www.flightglobal.com/pdfarchive/view/1949/1949%20-%201399.html">"Python"</a> a 1949 <i>Flight</i> article on the Python</li></ul>

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</style><div id="Armstrong_Siddeley_aero_engines102" style="font-size:114%;margin:0 4em"><a href="Armstrong_Siddeley" title="Armstrong Siddeley">Armstrong Siddeley</a> <a href="Aircraft_engine" title="Aircraft engine">aero engines</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Piston engines</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="Armstrong_Siddeley_Deerhound" title="Armstrong Siddeley Deerhound">Boarhound</a></li>

<li><a href="Armstrong_Siddeley_Cheetah" title="Armstrong Siddeley Cheetah">Cheetah</a></li>

<li><a href="Armstrong_Siddeley_Genet_Major" title="Armstrong Siddeley Genet Major">Civet</a></li>

<li><a href="Armstrong_Siddeley_Cougar" title="Armstrong Siddeley Cougar">Cougar</a></li>

<li><a href="Armstrong_Siddeley_Deerhound" title="Armstrong Siddeley Deerhound">Deerhound</a></li>

<li><a href="Armstrong_Siddeley_Genet" title="Armstrong Siddeley Genet">Genet</a></li>

<li><a href="Armstrong_Siddeley_Genet_Major" title="Armstrong Siddeley Genet Major">Genet Major</a></li>

<li><a href="Armstrong_Siddeley_Hyena" title="Armstrong Siddeley Hyena">Hyena</a></li>

<li><a href="Armstrong_Siddeley_Jaguar" title="Armstrong Siddeley Jaguar">Jaguar</a></li>

<li><a href="Armstrong_Siddeley_Panther" title="Armstrong Siddeley Panther">Jaguar Major</a></li>

<li><a href="Armstrong_Siddeley_Leopard" title="Armstrong Siddeley Leopard">Leopard</a></li>

<li><a href="Armstrong_Siddeley_Cheetah" title="Armstrong Siddeley Cheetah">Lynx Major</a></li>

<li><a href="Armstrong_Siddeley_Mongoose" title="Armstrong Siddeley Mongoose">Mongoose</a></li>

<li><a href="Armstrong_Siddeley_Ounce" title="Armstrong Siddeley Ounce">Ounce</a></li>

<li><a href="Armstrong_Siddeley_Panther" title="Armstrong Siddeley Panther">Panther</a></li>

<li><a href="Armstrong_Siddeley_Serval" title="Armstrong Siddeley Serval">Serval</a></li>

<li><a href="Siddeley_Tiger" title="Siddeley Tiger">Tiger (V12)</a></li>

<li><a href="Armstrong_Siddeley_Tiger" title="Armstrong Siddeley Tiger">Tiger (Radial)</a></li>

<li><a href="Armstrong_Siddeley_Deerhound" title="Armstrong Siddeley Deerhound">Wolfhound</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Turbojets</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="Armstrong_Siddeley_Adder" title="Armstrong Siddeley Adder">Adder</a></li>

<li><a href="Armstrong_Siddeley_Sapphire" title="Armstrong Siddeley Sapphire">Sapphire</a></li>

<li><a href="Armstrong_Siddeley_Viper" title="Armstrong Siddeley Viper">Viper</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Turboprops</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="Armstrong_Siddeley_Double_Mamba" title="Armstrong Siddeley Double Mamba">Double Mamba</a></li>

<li><a href="Armstrong_Siddeley_Mamba" title="Armstrong Siddeley Mamba">Mamba</a></li>

</ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Rocket engines</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Armstrong_Siddeley_Snarler" title="Armstrong Siddeley Snarler">Snarler</a></li>

<li><a href="Armstrong_Siddeley_Screamer" title="Armstrong Siddeley Screamer">Screamer</a></li>

<li><a href="Armstrong_Siddeley_Stentor" title="Armstrong Siddeley Stentor">Stentor</a></li>

<li><a href="Bristol_Siddeley_Gamma" title="Bristol Siddeley Gamma">Gamma</a></li></ul>

</div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-02-10" href="https://en.wikipedia.org/wiki/?title=Armstrong_Siddeley_Python&oldid=1274985931">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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