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Alvis Leonides Major


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

Leonides Major, geared, fixed wing version
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: 1,117 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)
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)



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