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]
| Gnat | |
|---|---|
| Type | Flat-twin aero engine |
| National origin | United Kingdom |
| Manufacturer | ABC Motors Limited |
| Designer | Granville Bradshaw |
| First run | 1916 |
| Number built | 17 |
Applications edit
Specifications (Gnat I) edit
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)
See also edit
Comparable engines
Related lists
References edit
Notes edit
Bibliography edit
- Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.