ABC Gnat

Gnat
Type	Flat-twin aero engine
National origin	United Kingdom
Manufacturer	ABC Motors Limited
Designed by	Granville Bradshaw
First run	1916
Number built	17

The ABC Gnat was a 45 hp (34 kW) two-cylinder aero engine designed by British engineer Granville Bradshaw for use in light aircraft. The Gnat was built by ABC Motors, first running in 1916, production ceased in December 1918. 17 engines were built from an original order of 18.^[1]

Applications[]

BAT Crow
Blackburn Sidecar
Eastchurch Kitten
Grain Kitten
Loening M-2 Kitten
Macchi M.16G
Royal Flying Corps ‘Aerial Target’^[2]
Sopwith Sparrow
Sopwith Tadpole

Specifications (Gnat I)[]

Data from Lumsden^[3]

General characteristics

Type: 2-cylinder air-cooled flat-twin
Bore: 4.33 in (110 mm)
Stroke: 4.72 in (120 mm)
Displacement: 139.06 cu in (2.28 L)
Dry weight: 115 lb (52 kg)

Components

Valvetrain: Overhead valve, two valves per cylinder
Fuel system: Single A.B.C. carburettor
Fuel type: Petrol (40-50 Octane rating)
Cooling system: Air-cooled

Performance

Power output: 45 hp (34 kW) at 1,920 rpm (takeoff power)
Specific power: 0.32 hp/cu in (14.9 kW/L)
Compression ratio: 3.8:1
Power-to-weight ratio: 0.4 hp/lb (0.6 kW/kg)

References[]

Notes[]

^ Lumsden 2003, p.51.
^ Professor A. M. Low FLIGHT, 3 October, 1952 page 436 “The First Guided Missile”
^ Lumsden 2003, p.276.

Bibliography[]

Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links[]

[1] Lumsden 2003, p.51.

[2] Professor A. M. Low FLIGHT, 3 October, 1952 page 436 “The First Guided Missile”

[3] Lumsden 2003, p.276.

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