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Alvis Leonides Major

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Leonides Major
Type

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This page is a soft redirect. Radial engine #REDIRECTmw:Help:Magic words#Other
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National origin

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Manufacturer

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Major applications

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Developed from

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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

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: 4.80in (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)

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. 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

Performance

  • 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)

See also

Related development

Comparable engines
Related lists

References

Notes
  1. ^ Gunston 1989, p.13.
  2. ^ Lumsden 2003, pp.60-61.
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.
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External links

de:Alvis Leonides