ABC Scorpion
# ABC Scorpion

The ABC Scorpion is a 30 hp (22 kW) 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
* Peyret-Mauboussin PM X
* RWD 1
* SAI KZ I
* Saynor & Bell Canadian Cub
* Short Satellite
* Snyder Buzzard
* Udet U 7 Kolibri
* Wheeler Slymph
* Westland Woodpigeon

## Survivors

The only ANEC II (G-EBJO) flies regularly at the Shuttleworth Collection at Old Warden and is powered by a Scorpion II.

## Specifications (Scorpion I)

Data from Lumsden

### General characteristics

* 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)

### Components

* Valvetrain: Overhead valve, two valves per cylinder
* Fuel system: Carburettor
* Fuel type: 74 Octane petrol
* Cooling system: Air

### Performance

* 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)
