Napier Javelin
| Javelin | |
|---|---|
 | |
| Type | Piston aero-engine |
| Manufacturer | D. Napier & Son |
| First run | 1932 |
| Major applications | Martin-Baker M.B.1 (one aircraft only) Percival Mew Gull |
The Napier Javelin was a British six-cylinder inline air-cooled engine designed by Frank Halford and built by D. Napier & Son.[1] First flown in March 1934 in the prototype of the Percival Mew Gull racing aircraft, the engine was also used in the Spartan Arrow biplane and the Percival Gull.[2]
Design
The six cylinders were arranged inverted and inline. Unlike the similar de Havilland Gipsy Six the poppet valves were operated by a single gear driven overhead camshaft.
Variants
Javelin I
- Initial version producing 150 hp.
Javelin III
- A longer stroke and increased capacity version of 160 hp.
Javelin IIIA
- A Mark III with a starter motor, generator and other improvements for the Martin Baker MB.1.
Applications
Specifications (Javelin I)
Data from [1]
General characteristics
- Type: 6-cylinder inverted inline air-cooled engine.
- Bore: 4.5 in (114.3 mm)
- Stroke: 5.25 in (133.35 mm)
- Displacement: 501 cu in (8.21 L)
- Length: 58.5 in (1486 mm)
- Width: 26 in (660.4 mm)
- Height: 31.5 in (800 mm)
- Dry weight: 410 lb (186 kg)
Components
- Valvetrain: Overhead cam poppet-valves
- Fuel system: Twin updraught carburettors
- Fuel type: Petrol
- Cooling system: Air-cooled
- Reduction gear: Direct drive, left hand tractor
Performance
- Power output: 150 hp (112 kW) at 2,000 rpm
- Compression ratio: 5.3:1
- Power-to-weight ratio: 0.365 hp/lb
See also
Comparable engines
Related lists
References
Notes
Bibliography
- Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
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