Rolls-Royce Buzzard

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Type Piston V-12 aero engine
Manufacturer Rolls-Royce Limited
First run June 1928
Major applications Hawker Horsley
Short Sarafand
Number built 100
Developed from Rolls-Royce Kestrel
Developed into Rolls-Royce R

The Rolls-Royce Buzzard (also referred to as the H engine) was a British piston aero engine of 36.7 litres (2,240 cubic inches) capacity that produced about 800 horsepower (600 kW). Designed and built by Rolls-Royce Limited it featured 12 cylinders in a 'V' configuration of 6 in (150 mm) bore and 6.6 in (170 mm) stroke. It was manufactured in the late 1920s, but only 100 were sold. A further development was the Rolls-Royce R Schneider Trophy engine. The Buzzard was developed by scaling-up the Kestrel engine in the ratio of 5:6.[1]


List from Lumsden.

Buzzard IMS, (H.XIMS)
(1927), Maximum power 955 hp (712 kW), nine engines produced at Derby.
Buzzard IIMS, (H.XIIMS)
(1932-33), Maximum power 955 hp (712 kW), reduced propeller drive ratio (0.553:1), 69 engines produced at Derby.
Buzzard IIIMS, (H.XIVMS)
(1931-33), Maximum power 937 hp (699 kW), further reduced propeller drive ratio (0.477:1), 22 engines produced at Derby.


The sole Buzzard-powered Vickers Type 207 circa 1933

Specifications (Buzzard IMS)[edit]

Data from Lumsden[2]

General characteristics

  • Type: 12-cylinder liquid-cooled Vee aircraft piston engine
  • Bore: 6 in (152.4 mm)
  • Stroke: 6.6 in (167.6 mm)
  • Displacement: 2,239.3 in³ (36.7 L)
  • Length: 75.7 in (1,923 mm)
  • Width: 30.6 in (777 mm)
  • Height: 44.4 in (1,128 mm)
  • Dry weight: 1,140 lb (517 kg)



See also[edit]

Related development

Comparable engines

Related lists



  1. ^ Rubbra 1990, p. 59.
  2. ^ Lumsden 2003, p.198.


  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
  • Rubbra, A.A.Rolls-Royce Piston Aero Engines - A Designer Remembers. Rolls-Royce Heritage Trust. Historical Series no 16. 1990. ISBN 1-872922-00-7]

External links[edit]