The ABC Scorpion is a 30 hp (22 kW) flat twin, two-cylinder aero engine designed by British engineer Granville Bradshaw for use in light aircraft. The engine was built by ABC Motors Limited and first ran in 1921.
Variants:
Scorpion I
1923, 30 hp (22 kW)
Scorpion II
1924, 34 hp (25 kW), increased bore and stroke.
Applications
ABC Robin
Boulton Paul Phoenix
BFW M.19
BFW M.23
Comper Swift
de Havilland Humming Bird
Farman Moustique
Hawker Cygnet
Heath Parasol
Hendy Hobo
Henderson-Glenny Gadfly
Kay Gyroplane
Luton Minor
Mignet HM.14 Pou-du-Ciel
Parmentier Wee Mite
SAI KZ I
Short Satellite
Snyder Buzzard
Wheeler Slymph
Westland Woodpigeon
Specifications:
Scorpion I
Type: 2 cylinder air cooled flat-twin
Bore: 3.6 in (87.5 mm)
Stroke: 3.7 in (91.5 mm)
Displacement: 73.32 cu in (1.1 L)
Dry weight: 90 lb (41 kg)
Valvetrain: Overhead valve, two valves per cylinder
Fuel system: Carburettor
Fuel type: 74 Octane petrol
Cooling system: Air
Power output: 30 hp (22 kW) at 2,750 rpm
Compression ratio: 4:1
Power-to-weight ratio: 0.33 hp/lb (0.53 kW/kg)
All Aero 