Alvis Leonides Major
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The Alvis Leonides Major is a British air-cooled 14-cylinder
radial Radial is a geometric term of location which may refer to: Mathematics and Direction * Vector (geometric), a line * Radius, adjective form of * Radial distance (geometry), a directional coordinate in a polar coordinate system * Radial set * A ...
aero engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Aircraft using power components are referred to as powered flight. Most aircraft engines are either piston engines or gas turbin ...
developed by
Alvis Alvis is a given name and a surname (close to the uncommon Scottish surname Alves). Alvis may also refer to: *Alvi, a Muslim community in South Asia, who claims descent from the fourth Rashidun caliph, Ali ibn Abi Talib *Alvis Car and Engineering ...
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