Alvis Leonides Major

The Alvis Leonides Major is a British air-cooled 14-cylinder radial aero engine developed by Alvis from the earlier nine-cylinder Leonides.

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 and the 751/1 for helicopters at . 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.Lumsden 2003, pp.60-61.

Variants Data from:British Piston Engines and their Aircraft. Leonides Major 702/1 for aeroplanes, also known as A.LE.M.1-1 in Air Ministry Leonides Major 751/1 for helicopters, also known as A.LE.M.1-2 Leonides Major 755/1 for helicopters in a 35° canted mounting, also known as A.LE.M.1-6 and as Mk.155 in civil aircraft Leonides Major 755/2 for helicopters in a vertical mounting, also known as A.LE.M.1-6 and as Mk.160 in civil aircraft

Applications Bristol Type 173 Mk3 – 2x 755/1 (Mk.155) ; 2x 755/2 (Mk.160) Handley Page HPR.5 Herald – four 702/1 Westland Whirlwind 1x 755/1 (Mk.155) or 1x 755/2 (Mk.160)

Specifications (Leonides Major 702/1)

See also

References

de:Alvis Leonides