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Armstrong Siddeley Genet


The Armstrong Siddeley Genet was a five-cylinder, air-cooled, radial engine for aircraft use built in the UK, first run in 1926. It developed 80 hp at 2,200 rpm in its final form and was a popular light aircraft powerplant. The Genet was later developed inti the Genet Major.

Variants and applications:

Genet I
Genet I producing 65 hp.
Avro 618 Ten
Avro Avian prototype
Blackburn Bluebird I
BFW M.23
Cierva autogyros. C.9 and C.10
Drzewiecki JD-2
Fleet Fawn
Junkers A50 Junior
Saro Cutty Sark
Southern Martlet
Westland-Hill Pterodactyl

Genet II
The Genet II produced 80 hp due to an increased compression ratio of 5.25:1.
Avro Avian
Blackburn Bluebird II
Cierva C.19 autogyro
Darmstadt D-18
de Havilland DH.60 Moth
Fairchild 21
Klemm Kl 25
Nicholas-Beazley NB-8G
Parnall Imp
Robinson Redwing II
Southern Martlet
Westland Widgeon

Genet IIA
Also 80 hp and with minor differences to the Mark I.
Robinson Redwing II


Genet I
Type: 5-cylinder single-row radial
Bore: 4 in (101.6 mm)
Stroke: 4 in (101.6 mm)
Displacement: 251.43 cu in (4.1 L)
Length: 28.5 in (724 mm)
Diameter: 34 in (863.6 mm)
Dry weight: 168 lb (76 kg)
Valvetrain: Overhead poppet valves
Cooling system: Air-cooled
Reduction gear: Direct drive, Left hand tractor
Power output: 65 hp at 1,800 rpm
Compression ratio: 5.2:1
Power-to-weight ratio: 0.38 hp/lb


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