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The Armstrong Siddeley Genet Major is a British five-cylinder (later seven-cylinder), air-cooled, radial engine for aircraft, designed and built by Armstrong Siddeley and first run in 1928. It developed 140 horsepower (104 kW). In Royal Air Force use the seven-cylinder version was known as the Civet I. The Feliform names used are in line with company convention, the Genet and Civet[1] both being large cat-like carnivores.

Variants and applications

The Genet Major 1 was a five-cylinder engine of 105 horsepower (78 kW) that was closely related to the Genet I but with increased bore and stroke.

The Genet Major 1A (or Civet I in RAF service) was a seven-cylinder development of the Genet Major I, nominally rated at 145 horsepower (108 kW).

As Genet Major IA but with cylinders using cast rocker boxes.

A geared propeller drive version of the Genet Major IA, 160 horsepower (120 kW).


An Armstrong Siddeley Genet Major powers Southern Martlet (G-AAYX) which is owned and operated by the Shuttleworth Collection at Old Warden and flies at home air displays throughout the summer months.[2]

Engines on display

Specifications (Genet Major IA/Civet I)

Data from Lumsden[6]

  • Type: 7-cylinder single-row radial piston engine
  • Bore: 4.25 in (107.95 mm)
  • Stroke: 4.5 in (114.3 mm)
  • Displacement: 452.01 cu in (7.3 L)
  • Length: 38.8 in (985.5 mm)
  • Diameter: 38.15 in (970 mm)
  • Dry weight: 327 lb (148 kg)

See also

Related development

Comparable engines

Related lists

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