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Armstrong Siddeley Lynx

From Wikipedia, the free encyclopedia

Armstrong Siddeley Lynx OW.JPG
Armstrong Siddeley Lynx fitted to the Shuttleworth Collection's airworthy Avro Tutor
Type Radial aero engine
National origin United Kingdom
Manufacturer Armstrong Siddeley
First run 1920
Number built 6,000
Developed from Armstrong Siddeley Jaguar
Developed into Armstrong Siddeley Cheetah

The Armstrong Siddeley Lynx is a British seven-cylinder aero engine developed by Armstrong Siddeley. Testing began in 1920 and 6,000 had been produced by 1939. In Italy Alfa Romeo built a 200 horsepower (150 kW) licensed version of this engine named the Alfa Romeo Lynx.[1]


Lynx I
1920, 150 hp.
Lynx II
1920, 184 hp.
Lynx III
1924, 200 hp.
Lynx IV
1929, 180 hp.
Lynx IVA
1930, 188 hp.
Lynx IVC
1929, 208/225 hp.
Lynx IV(G)
1929, Geared propellor drive.
Lynx IV(MOD)
1929, 188 hp, reconditioned and modified Lynx IV.
Lynx IV(S)
1928, 200 hp, Fully supercharged.
Lynx V (Lynx Major)
1930, increased bore and stroke, name changed from Lynx V to Lynx Major then Cheetah. Effectively half a Panther[2]
Piaggio P.II
Licence production in Italy by Piaggio.


Alfa Romeo Lynx


  • Avro Tutor, K3215, powered by a Lynx IV, flies regularly at the Shuttleworth Collection and can be viewed in the museum at other times.[3]

Specifications (Lynx IV)

Armstrong Siddeley Lynx 7-cylinder radial from the Avro 618 Ten aircraft, Southern Cloud
Armstrong Siddeley Lynx 7-cylinder radial from the Avro 618 Ten aircraft, Southern Cloud

Data from Lumsden[4]

General characteristics

  • Type: 7-cylinder air-cooled radial engine
  • Bore: 5.0 in (127 mm )
  • Stroke: 5.5 in (140 mm)
  • Displacement: 756 cu in (12.4 L)
  • Length: 45.6 in (1,158 mm)
  • Diameter: 42 in (1,067 mm)
  • Dry weight: 525 lb (238 kg )



  • Power output: 187 hp (139 kW) at 1,700 rpm cruise / 215 hp (160 kW) at 1,900 rpm max
  • Power-to-weight ratio: 0.35 hp/lb (0.6 kW/kg)

See also

Related development

Comparable engines

Related lists



  1. ^ "Alfa Aero Engines". Archived from the original on 8 October 2007. Retrieved 25 August 2007.
  2. ^ Lumsden 2003, p.74.
  3. ^ The Shuttleworth Collection - Avro Tutor Retrieved: 11 February 2009
  4. ^ Lumsden 2003, p.66-67.


  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
This page was last edited on 17 April 2021, at 03:11
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