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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 both being large cat-like carnivores.
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Genet Major I
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.
Genet Major 1A (Civet I)
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).
Genet Major III
As Genet Major IA but with cylinders using cast rocker boxes.
Genet Major IV
A geared propeller drive version of the Genet Major IA, 160 horsepower (120 kW).
Survivors
An Armstrong Siddeley Genet Major powers the Southern Martlet owned and operated by the Shuttleworth Collection and flies regularly throughout the summer months.
Engines on display
Specifications (Genet Major IA/Civet I)
Data from Lumsden