Aircraft Type Index

Aircraft Engine index

                   

 

The Alvis Leonides Major Aircraft Engine

Alvis designed the Leonides Major 14 cylinder twin row radial engine in the early 1950's based on their existing 9 cylinder engine. The engine sold in both aircraft and helicopter variants, most Alvis Leonides Major engines produced were for use in the Westland Whirlwind helicopter, these were direct-drive de-rated engines fitted with a fan for cooling as pictured below.

Alvis Leonides Major Aircraft Engine

 

Fixed wing aircraft and helicopters that were powered by the Alvis Leonides Major

Westland Whirlwind helicopterBristol Type 173 Mk1 & 2 helicopter
Handley Page Herald prototype airlinerHandley Page H.P.R.1 Marathon transport aircraft
  

Alvis Leonides Major (fixed wing) Specifications:

  • Type: 14-cylinder, twin-row air-cooled supercharged radial piston engine
  • Bore: 4.80in (122 mm)
  • Stroke: 4.41 in (112 mm)
  • Displacement: 1,117 cu in (18.34 L)
  • Length: 70.9 in (1.80 m)
  • Diameter: 38.9 in
  • Width: 988 mm
  • Dry weight: (dry) 1,200 lb (545 kg)
  • Valve-train: 2 sodium cooled valves per cylinder
  • Supercharger: Single speed, single stage
  • 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 octane
  • Oil system: Dry sump, pressure and scavenge pumps
  • Cooling system: Air-cooled
  • Reduction gear: Epicyclical, ratio 0.533:1
  • Power output: 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)
 

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Alvis Leonides Major Aircraft Engine picture and Specifications

 

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