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From Wikipedia, the free encyclopedia

Type Rotary aero engine
Manufacturer Gnome et Rhone
First run c.1911
Major applications Blériot XXI
Handley Page H.P.3

The Gnome 7 Gamma was a French designed, seven-cylinder, air-cooled rotary aero engine. Powering several pre-World War I era aircraft types it produced 70 horsepower (52 kW) from its capacity of 12 litres (680 cubic inches).[1]

A 14-cylinder variant was known as the Gnome 14 Gamma-Gamma.


Gnome 7 Gamma
Seven-cylinder, single-row rotary engine.
Gnome 14 Gamma-Gamma
14-cylinder, two-row rotary engine using Gamma cylinders. 140 hp (104 kW).


List from Lumsden

Gnome 7 Gamma

Gnome 14 Gamma-Gamma

Specifications (Gnome 7 Gamma)

Data from Lumsden.[1]

General characteristics


  • Valvetrain: Automatic centre-piston inlet valve, overhead exhaust valve (one each per cylinder)
  • Cooling system: Air-cooled
  • Reduction gear: Direct drive, right-hand tractor, left-hand pusher


  • Power output: 52.2 kW (70 hp) at 1,200 rpm

See also

Comparable engines

Related lists



  1. ^ a b Lumsden 2003, p. 151.


  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
This page was last edited on 17 April 2021, at 04:15
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