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Armstrong Siddeley Cheetah

January 01, 1970

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.[1]

Cheetah
Cheetah X
Type Radial engine
National origin United Kingdom
Manufacturer Armstrong Siddeley Motors Ltd.
First run 1935
Major applications Airspeed Oxford
Number built >37,200
Developed from Armstrong Siddeley Lynx

The Cheetah was used to power many British trainer aircraft during World War II including the Avro Anson and Airspeed Oxford.

Design and development edit

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.[1]

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.[2]

Variants edit

List from: Lumsden[3]Note:[4]

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.
 
Preserved Cheetah X
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 edit

 
Avro 626 Prefect

Survivors edit

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.[6][7]

Engines on display edit

Preserved Armstrong Siddeley Cheetah engines are on public display at the following museums:

Specifications (Cheetah IX) edit

 
Cheetah engine fitted to an Airspeed Oxford undergoing restoration

Data from [10]

General characteristics

  • Type: Seven-cylinder single-row supercharged air-cooled radial engine
  • Bore: 5.25 in (133 mm)
  • Stroke: 5.5 in (140 mm)
  • Displacement: 834 cu in (13.65 L)
  • Length: 52.8 in (1,342 mm)
  • Diameter: 47.6 in (1,210 mm)
  • Dry weight: 637 lb (289 kg)

Components

Performance

See also edit

Related development

Comparable engines

Related lists

References edit

Notes edit

  1. ^ a b Lumsden 2003, p.74.
  2. ^ Gunston 1989, p.18.
  3. ^ Lumsden 2003, pp.74-76.
  4. ^ Cheetah variants start at Mk V.
  5. ^ Lumsden, Alec (2003). British Piston Engines and their Aircraft. Marlborough, UK: Airlife Publishing. p. 75. ISBN 1-85310-294-6.
  6. ^ CAA - G-INFO - G-VROE 6 October 2015 at the Wayback Machine Retrieved: 15 February 2009
  7. ^ CAA - G-INFO - G-AHKX 5 October 2015 at the Wayback Machine Retrieved: 15 February 2009
  8. ^ "Aviation Heritage Museum | Bull Creek, Perth".
  9. ^ "Engines List". City of Norwich Aviation Museum. Retrieved 27 August 2023.
  10. ^ Lumsden 2003, p.75.

Bibliography edit

  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

Further reading edit

  • Bridgman, L, ed. (1998). Jane's fighting aircraft of World War II. Crescent. ISBN 978-0-517-67964-7.
  • Gunston, Bill. Development of Piston Aero Engines. Cambridge, England. Patrick Stephens Limited, 2006. ISBN 0-7509-4478-1

External links edit

 
Wikimedia Commons has media related to Armstrong Siddeley Cheetah.
  • Flight magazine, 19 May 1939 - Introduction of the Cheetah X - Flightglobal.com

January 01, 1970
armstrong, siddeley, cheetah, seven, cylinder, british, cooled, aircraft, radial, engine, capacity, introduced, 1935, produced, until, 1948, early, variants, cheetah, were, initially, known, lynx, major, cheetah, cheetah, type, radial, engine, national, origin. 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 1 Cheetah Cheetah X Type Radial engine National origin United Kingdom Manufacturer Armstrong Siddeley Motors Ltd First run 1935 Major applications Airspeed Oxford Number built gt 37 200 Developed from Armstrong Siddeley Lynx The Cheetah was used to power many British trainer aircraft during World War II including the Avro Anson and Airspeed Oxford Contents 1 Design and development 2 Variants 3 Applications 4 Survivors 5 Engines on display 6 Specifications Cheetah IX 6 1 General characteristics 6 2 Components 6 3 Performance 7 See also 8 References 8 1 Notes 8 2 Bibliography 9 Further reading 10 External linksDesign and development editThe 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 1 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 2 Variants editList from Lumsden 3 Note 4 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 nbsp Preserved Cheetah X 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 edit nbsp Avro 626 Prefect Airspeed Consul Airspeed Courier Airspeed Envoy Airspeed Oxford Airspeed Queen Wasp Airspeed Viceroy Avro 626 Avro 652 Avro Anson Blackburn Lincock Bristol Bulldog TM type 124 5 CASA C 201 Alcotan de Havilland Hawk Moth Handley Page H P R 2 Hispano HS 42 IAe 22 DL Kingsford Smith PL 7 Koolhoven F K 51 Lancashire Aircraft Prospector Marinens Flyvebaatfabrikk M F 8 Marinens Flyvebaatfabrikk M F 10 Percival Provost prototype SEA 1 VEF JDA 10MSurvivors editAs 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 6 7 Engines on display editPreserved Armstrong Siddeley Cheetah engines are on public display at the following museums Arkansas Air amp Military Museum Aviation Heritage Museum Western Australia 8 Brooklands Museum City of Norwich Aviation Museum in Horsham St Faith Norfolk 9 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 DisplaysSpecifications Cheetah IX edit nbsp Cheetah engine fitted to an Airspeed Oxford undergoing restoration Data from 10 General characteristics Type Seven cylinder single row supercharged air cooled radial engine Bore 5 25 in 133 mm Stroke 5 5 in 140 mm Displacement 834 cu in 13 65 L Length 52 8 in 1 342 mm Diameter 47 6 in 1 210 mm Dry weight 637 lb 289 kg Components Valvetrain Two pushrod actuated valves per cylinder Supercharger Centrifugal 5 4 1 reduction Fuel system Claudel Hobson carburettor Fuel type 87 octane rating petrol Cooling system Air cooled Reduction gear No Performance Power output 338 hp 252 kW at 2 100 rpm for takeoff 345 hp 257 kW at 2 425 rpm at 7 875 ft 2 400 m Specific power 0 41 hp cu in 18 83 kW L Compression ratio 6 35 1 Specific fuel consumption 0 45 lb hp hr 271 g kW hr Oil consumption 0 24 0 45 oz hp hr 9 17 g kW hr Power to weight ratio 0 54 hp lb 0 89 kW kg See also editRelated development Armstrong Siddeley Lynx Armstrong Siddeley Panther Comparable engines Avia Rk 17 Bristol Neptune Gnome Rhone 7K Jacobs R 830 Piaggio Stella P VII Pratt amp Whitney Wasp Junior Wright R 760 Related lists List of aircraft enginesReferences editNotes edit a b Lumsden 2003 p 74 Gunston 1989 p 18 Lumsden 2003 pp 74 76 Cheetah variants start at Mk V Lumsden Alec 2003 British Piston Engines and their Aircraft Marlborough UK Airlife Publishing p 75 ISBN 1 85310 294 6 CAA G INFO G VROE Archived 6 October 2015 at the Wayback Machine Retrieved 15 February 2009 CAA G INFO G AHKX Archived 5 October 2015 at the Wayback Machine Retrieved 15 February 2009 Aviation Heritage Museum Bull Creek Perth Engines List City of Norwich Aviation Museum Retrieved 27 August 2023 Lumsden 2003 p 75 Bibliography edit Gunston Bill World Encyclopedia of Aero Engines Cambridge England Patrick Stephens Limited 1989 ISBN 1 85260 163 9 Lumsden Alec British Piston Engines and their Aircraft Marlborough Wiltshire Airlife Publishing 2003 ISBN 1 85310 294 6 Further reading editBridgman L ed 1998 Jane s fighting aircraft of World War II Crescent ISBN 978 0 517 67964 7 Gunston Bill Development of Piston Aero Engines Cambridge England Patrick Stephens Limited 2006 ISBN 0 7509 4478 1External links edit nbsp Wikimedia Commons has media related to Armstrong Siddeley Cheetah Flight magazine 19 May 1939 Introduction of the Cheetah X Flightglobal com Retrieved from https en wikipedia org w index php title Armstrong Siddeley Cheetah amp oldid 1174504041, wikipedia, wiki, book, books, library,

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