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Armstrong Siddeley Genet Major / Civet


Genet Major

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 and Civet both being large cat-like carnivores.


Armstrong Siddeley Civet

Variants and applications:

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.


Avro Avian
Avro 619
Avro 624
Avro 638 Club Cadet
Cierva C.19 Autogiro
Civilian Coupé
Saro Cutty Sark
Southern Martlet
Westland IV

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).


Avro Avian
Avro Cadet
Avro Rota
Cierva C.30A Autogiro
RWD-6 (not specified 7-cylinder Genet Major sub-type)
Saro Cutty Sark
Westland Wessex

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).




Genet Major IA / Civet I

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)
Valvetrain: Overhead poppet valves
Fuel type: 77 Octane petrol
Cooling system: Air-cooled
Reduction gear: Direct drive, Left hand tractor
Power output: 165 hp (123 kW) at 2,425 rpm at sea level
Compression ratio: 5:1
Power-to-weight ratio: 0.5 hp/lb



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