Alvis Leonides Major
|Type||National origin|| Manufacturer
|| Major applications
|| Developed from
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.
- Bristol Type 173 Mk1,2 & Mk3 – 2x 755/1 Mk 155, 780hp, 755/2 Mk 160, 780hp or 2x 850 hp
- Handley Page Herald – four 870 hp
- Handley Page H.P.R.1 Marathon – two
- Westland Whirlwind 1 x 755/1 Mk 155, 780hp
Specifications (Leonides Major, geared, fixed wing version)
Data from Jane's All the World's Aircraft 1956-57 pp.417-9
- Type: 14-cylinder, twin-row air-cooled radial piston engine, geared down and supercharged
- Bore: 4.80in (122 mm)
- Stroke: 4.41 in (112 mm)
- Displacement: 1,118 cu in (18.33 L)
- Length: 70.9 in (1.80 m)
- Diameter: 38.9 in
- Width: 988 mm
- Dry weight: (dry) 1,200 lb (545 kg)
- 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. 2 plugs per cylinder, twin BTH C.14.C/1 magnetos
- Fuel type: 100/130 grade
- Oil system: Dry sump, pressure and scavenge pumps
- Cooling system: Air-cooled
- Reduction gear: Farman type epicyclic, ratio 0.533:1
- Power output: (international rating) 860 hp (642 kW) at 1,500 ft (457 m)
- Compression ratio: 6.8:1
- Fuel consumption: (at maximum continuous power) 60 Imp. gal/h (273 L/h)
- Oil consumption: 6-12 pint/h (3.4-6.8 L/h)
- Related development
- Comparable engines
- Related lists
- Gunston 1989, p.13.
- Lumsden 2003, pp.60-61.
- 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.
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