View source for Rolls-Royce Condor

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{{Use dmy dates|date=January 2018}}
{{Use British English|date=January 2018}}
{|{{Infobox aircraft begin
 |name=Condor
 |image=Rolls-Royce Condor III RRHT Derby.jpg
 |caption=Rolls-Royce Condor III on display at the [[Rolls-Royce Heritage Trust, Derby]]
}}{{Infobox Aircraft Engine
 |type=[[Piston]] [[V12 engine|V-12]]
 |manufacturer=[[Rolls-Royce Limited]]
 |first run=1918
 |major applications=
 |number built = 327
 |program cost = 
 |unit cost = 
 |developed from = [[Rolls-Royce Eagle]]
 |developed into = 
 |variants with their own articles =
}}
|}

The '''Rolls-Royce Condor''' aircraft piston engine is a larger version of the [[Rolls-Royce Eagle]] developing up to {{convert|675|hp|kW|abbr=off}}. The engine first ran in 1918 and a total of 327 engines were recorded as being built.<ref>Lumsden 2003, p.188.</ref>

==Variants==
''Note:''<ref>List from Lumsden 2003, pp. 188-190</ref>
;Condor I
:(1920–1921) 600 hp, 72 built at Derby.
;Condor IA
:Alternative designation for Condor II.
;Condor II
:(1921) 650 hp, revised propeller reduction gear ratio, increased compression ratio (5.17:1). 34 built at Derby.
;Condor III
:(1923–1927) 650/670 hp, compression ratio 6.5:1, Re-designed [[connecting rod]]s. 196 built at Derby.
;Condor IIIA
:(1925) 650/665 hp. Improved [[main bearing]] design and material.
;Condor IIIB
:(1930) 650 hp, 0.477:1 reduction gear, re-designed [[crankcase]] and [[crankshaft]].
;Condor IV
:(1925) 750 hp. Direct-drive, modified engine mounting. 13 built at Derby.
;Condor IVA
:(1927) 750 hp. Nine built at Derby.
;Condor V
:(1925) As Condor IIIA with two-stage [[turbocharger]]. Run but not flown, one built at Derby.
;Condor VII
:Direct-drive Condor IIIA, two built at Derby. 
;Condor C.I.
:(1932) 480 hp, compression ignition (diesel), two engines tested and flown.

===Compression ignition (diesel) variant===

In 1932 the [[Air Ministry]] initiated a conversion of the Condor petrol engine to the [[Diesel engine|compression ignition]] system. The conversion was developed at the [[Royal Aircraft Establishment]], [[Farnborough Airfield|Farnborough]], with the co-operation of Rolls-Royce Ltd. Engine layout, bore, and stroke remained the same as for the petrol version; the compression ratio increased to 12.5:1. The more robust construction required to withstand the increased stresses increased the engine weight to {{convert|1,504|lb|kg}}. At its maximum 2,000 rpm the engine developed 500&nbsp;hp (373&nbsp;kW), giving a power/weight ratio of 0.33&nbsp;hp/lb.<ref>[http://www.flightglobal.com/pdfarchive/view/1932/1932%20-%201172.html ''Flight'', 17 November 1932, p. 1094] www.flightglobal.com Retrieved: 5 April 2010</ref>

The engine passed the 50-hour civil type test for compression ignition engines, being only the second British engine to do so. The only previous engine to pass this test was the much larger [[Beardmore Tornado]] fitted to the [[R101]] [[airship]]. The diesel Condor was experimentally flown in a [[Hawker Horsley]] to explore the practical operation of a diesel engine in flight.

==Applications==
[[File:Blackburn Iris Mk III S1263.jpg|thumb|right|Rolls-Royce Condor powered [[Blackburn Iris]] seaplane]]
The Condor was used in the following aircraft:
{{columns-list|
*[[Avro Aldershot]] 
*[[Avro Andover]]
*[[Avro 557 Ava|Avro Ava]]
*[[Beardmore Inflexible]]
*[[Blackburn Iris]] 
*[[Bristol Berkeley]]
*[[de Havilland DH.27 Derby]]
*[[de Havilland Highclere|de Havilland DH.54 Highclere]]
*[[de Havilland Okapi|de Havilland DH.14 Okapi]] 
*[[Fairey Fremantle]]
*[[Fairey N.4]]
*[[Handley Page H.P.28 Handcross|Handley Page Handcross]]
*[[Hawker Hornbill]]
*[[Hawker Horsley]]
*[[R100]] 
*[[Rohrbach Ro V Rocco]]
*[[Saunders Valkyrie]]
*[[Short Singapore]] 
*[[Vickers Valentia]]
*[[Vickers Type 170 Vanguard|Vickers Vanguard]]
*[[Vickers Vixen]]
*[[Vickers Virginia]]
*[[Westland Yeovil]]
}}

==Specifications (Condor III)==
{{pistonspecs
|<!-- If you do not understand how to use this template, please ask at [[Wikipedia talk:WikiProject Aircraft]] -->
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|ref= ''Lumsden'' <ref>Lumsden 2003, p.189.</ref>
|type=12-cylinder liquid-cooled 60 deg. [[V12 engine|Vee]] aircraft piston engine
|bore={{convert|5.5|in|mm}}
|stroke={{convert|7.5|in|mm}}
|displacement={{convert|2,137.5|cuin|L|abbr=on}}
|length={{convert|69.3|in|mm}}
|diameter=
|width={{convert|41.1|in|mm}}
|height={{convert|43.2|in|mm}}
|weight={{convert|1,380|lb|kg}}
|valvetrain= [[Overhead camshaft]]
|supercharger=
|turbocharger=
|fuelsystem=2 x [[Claudel-Hobson]] carburettors
|fueltype= Petrol
|oilsystem=
|coolingsystem=Liquid-cooled
|power= {{convert|670|bhp|kW|abbr=on}} at 1,900 rpm
|specpower=
|compression=5.1:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=0.48 hp/lb
}}

==See also==
{{aircontent
<!-- other related articles that have not already linked: -->
|see also=
*[[Rolls-Royce aircraft piston engines]]
<!-- designs which were developed into or from this aircraft: -->
|related=
*[[Rolls-Royce Eagle]]
<!-- aircraft that are of similar role, era, and capability this design: -->
|similar aircraft=

<!-- relevant lists that this aircraft appears in: -->
|lists=
*[[List of aircraft engines]]
<!-- For aircraft engine articles. Engines that are of similar to this design: -->
|similar engines=
*[[Siddeley Tiger]]
<!-- See [[WP:Air/PC]] for more explanation of these fields. -->
}}

==References==

===Notes===
{{reflist}}

===Bibliography===
{{refbegin}}
* Lumsden, Alec. ''British Piston Engines and their Aircraft''. Marlborough, Wiltshire: Airlife Publishing, 2003. {{ISBN|1-85310-294-6}}.
{{refend}}

==External links==
{{Commons category}}
*[http://www.oldengine.org/members/diesel/Duxford/Condor2.jpg Photo of a Diesel version of the Condor at oldengine.org] {{Webarchive|url=https://web.archive.org/web/20070209090103/http://www.oldengine.org/members/diesel/Duxford/Condor2.jpg |date=9 February 2007 }}

{{Rolls-Royce aeroengines}}

[[Category:Rolls-Royce aircraft piston engines|Condor]]
[[Category:1910s aircraft piston engines]]
[[Category:Airship engines]]
[[Category:V12 aircraft engines]]