Armstrong Siddeley Leopard

Type Radial engine
National origin United Kingdom
Manufacturer Armstrong Siddeley
First run 1927

The Armstrong Siddeley Leopard was a British 14-cylinder twin-row air-cooled radial aero engine developed in 1927 by Armstrong Siddeley. It was the most powerful radial engine in the world when introduced.[1]


Leopard I
700 hp, medium supercharged. Direct drive propeller.
Leopard II
700 hp, geared epicyclic drive.
Leopard III
800 hp, two-valve cylinder head, direct drive.
Leopard IIIA
800 hp, geared epicyclic drive.


Specifications (Leopard I)

Data from [3]

General characteristics



See also

Comparable engines
Related lists



  1. Smith 1981, p.112.
  2. Single engine version only
  3. Lumsden 2003, p.69.


  • Smith, Herschel. Aircraft Piston Engines. New York, New York: McGraw-Hill, 1981. ISBN 0-07-058472-9.
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
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