title: Armstrong Siddeley Cheetah
text: The Armstrong Siddeley Cheetah is a seven-cylinder British air-cooled aircraft radial engine of 834 cu in (13.65 L) capacity introduced in 1935 and produced until 1948. Early variants of the Cheetah were initially known as the Lynx Major.
  
  The Cheetah was used to power many British trainer aircraft during World War II including the Avro Anson and Airspeed Oxford.
  
  Design and development
  The Cheetah was developed from the earlier Lynx using the increased bore cylinders from the Armstrong Siddeley Panther but the engine retained the stroke of the Lynx. Initially only direct-drive variants were produced with later engines being made available with propeller reduction gear of various ratios. Superchargers were also available for later variants, both geared and directly driven by the crankshaft.
  
  The basic design of the Cheetah remained unchanged from its introduction in 1935 to the last examples built in 1948. It was the first engine of its type to be certified for 1,200 hours of operational time between overhauls (TBO), with over 37,200 examples built.
  
  Variants
  List from: LumsdenNote:
  Lynx V (Lynx Major)
  1930, 230 hp (171 kW).
  Cheetah V
  1935, 270 hp (201 kW) at 2,100 rpm.
  Cheetah VA
  1935, 285 hp (212 kW) at 2,425 rpm.
  Cheetah VI
  1935, 307 hp (229 kW) at 2,425 rpm.
  Cheetah VIA
  1936, as Mk VI but with Mk IX cylinders. 
  
  Cheetah IX
  1937, 345 hp (257 kW) at 2,425 rpm.
  Cheetah X
  1938, 375 hp (280 kW) at 2,300 rpm.
  Cheetah XI
  345 hp (257 kW) at 2,425 rpm, geared version of Cheetah X.
  Cheetah XII
  Similar to Mk X, adapted for target drone aircraft.
  Cheetah XV
  420 hp (313 kW) at 2,425 rpm.
  Cheetah XVII
  1948, 385 hp (287 kW) at 2,425 rpm.
  Cheetah XVIII
  385 hp (287 kW) at 2,425 rpm, carburettor modified for aerobatics.
  Cheetah XIX
  355 hp (265 kW) at 2,425 rpm
  Cheetah 25
  345 hp (257 kW) at 2,425 rpm, Cheetah XV uprated to 475 hp (355 kW) at 2,700 rpm, modified constant-speed unit.
  Cheetah 26
  385 hp (287 kW).
  Cheetah 27
  1948, 385 hp (287 kW).
  
  Applications
  
  Survivors
  As of October 2008 at least four Cheetah engines remained airworthy. Two Cheetah 17s power the Anson T21 operated by the Classic Air Force and another pair of Cheetah 17s are fitted to Avro Nineteen, G-AHKX registered to BAE Systems but normally based at the Shuttleworth Collection.
  
  Engines on display
  Preserved Armstrong Siddeley Cheetah engines are on public display at the following museums:
  Arkansas Air & Military Museum
  Aviation Heritage Museum (Western Australia)
  Brooklands Museum
  City of Norwich Aviation Museum in Horsham St Faith, Norfolk.
  Fleet Air Arm Museum
  Historical Aircraft Restoration Society Albion Park, New South Wales, Australia
  Malta Aviation Museum
  Port Elizabeth branch of the South African Air Force Museum
  Royal Air Force Museum Cosford
  South Australian Aviation Museum, Adelaide. Two Mk9 Operational Displays
  
  Specifications (Cheetah IX)
  
  See also
  
  References
  
  Notes
  
  Bibliography
  
   Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. 
   Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. .
  
  Further reading
  
   Gunston, Bill. Development of Piston Aero Engines. Cambridge, England. Patrick Stephens Limited, 2006.
  
  External links
  
  Flight magazine, 19 May 1939 - Introduction of the Cheetah X - Flightglobal.com
  
  1930s aircraft piston engines
  Aircraft air-cooled radial piston engines
  Cheetah