Alvis Leonides Major


The Alvis Leonides Major was 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 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.

Variants

Data from:British Piston Engines and their Aircraft
Notes: A.LE designations from Air Ministry system ; 700 series designations from Alvis company designation system; Mark numbers for civil variants.
;A.LE.M.1-1: for aeroplanes
;A.LE.M.1-2: for vertical installation in helicopters
;A.LE.M.1-6: for helicopters in a 35° canted mounting or vertical mounting.
;Leonides Major 702/1: for aeroplanes
;Leonides Major 751/1: for helicopters
;Leonides Major 755/1: for helicopters in a 35° canted mounting
;Leonides Major 755/2: for helicopters in a vertical mounting
;Leonides Major Mk.155: for helicopters in a 35° canted mounting
;Leonides Major Mk.160: for helicopters in a vertical mounting

Applications