Alvis Leonides Major
| Leonides Major | |
|---|---|
| |
| Type | Radial engine |
| National origin | United Kingdom |
| Manufacturer | Alvis |
| Major applications | Westland Whirlwind |
| Developed from | Alvis Leonides |
The Alvis Leonides Major was a British air-cooled 14-cylinder radial aero engine developed by Alvis from the earlier nine-cylinder Leonides.[1]
Design and development
In 1951 Alvis started development of a 14 cylinder, two row radial of 1,118 cu in (18.3 L) displacement, based on the Leonides. Certification covered the Mk. 702/1 for aeroplanes at 875 hp and the 751/1 for helicopters at 850 hp. The only numerous model of the Major was the Mk. 755/1, a medium supercharged, de-rated, obliquely mounted direct-drive and fan cooled engine fitted to the Westland Whirlwind Mks. 5, 6, 7 and 8.[2]
Applications
- Bristol Type 173 Mk1,2 & Mk3 – 2x 755/1 Mk 155, 780 hp, 755/2 Mk 160, 780 hp or 2x 850 hp
- Handley Page Herald – four 870 hp on Prototype
- Handley Page H.P.R.1 Marathon – four
- Westland Whirlwind 1 x 755/1 Mk 155, 780 hp
Specifications (Leonides Major, geared, fixed wing version)
Data from Jane's All the World's Aircraft 1956-57 pp.417-9
General characteristics
- Type: 14-cylinder twin-row air-cooled radial piston engine, geared down and supercharged
- Bore: 4.80 in (122 mm)
- Stroke: 4.41 in (112 mm)
- Displacement: 1,118 cu in (18.32 L)
- Length: 70.9 in (180 cm)
- Diameter: 38.9 in (99 cm)
- Dry weight: 1,200 lb (540 kg) (dry)
Components
- Valvetrain: 2 sodium cooled valves per cylinder, driven by 2 cam disks
- Supercharger: Single speed single stage diven at 6.5:1
- Fuel system: Fuel injection, low pressure via Hobson or SU pump
- Fuel type: 100/130 octane
- Oil system: Dry sump, pressure and scavenge pumps
- Cooling system: Air-cooled
- Reduction gear: Farman type epicyclic, ratio 0.533:1
- 2 spark plugs per cylinder, twin BTH C.14.C/1 magnetos
Performance
- Power output: (international rating) 860 hp (642 kW) at 1,500 ft (457 m)
- Compression ratio: 6.8:1
- Fuel consumption: 60 imp gal (72 US gal; 270 L) per hour (at maximum continuous power)
- Oil consumption: 6-12 pint/h (3.4-6.8 L/h)
See also
Related development
Comparable engines
Related lists
References
- Notes
- Bibliography
- Bridgman, Leonard. Jane's All the World's Aircraft 1956-57. Jane's All the World's Aircraft Publishing Co. Ltd, London, 1956.
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9.
- Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
External links
Wikimedia Commons has media related to Alvis Leonides.