title: Gnome Gamma
text: # Gnome Gamma
  
  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).
  
  A 14-cylinder variant was known as the Gnome 14 Gamma-Gamma.
  
  ## Variants
  
  ### 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).
  
  ## Applications
  
  List from Lumsden
  
  ### Gnome 7 Gamma
  
  * Blériot XXI
  * Bristol Biplane Type T
  * Bristol Prier-Dickson
  * Henry Farman Biplane
  * Grahame-White Passenger Biplane VIIc
  * Handley Page H.P.3
  * Morane-Borel seaplane
  * Nieuport Monoplane
  * Paulhan Biplane
  * Royal Aircraft Factory B.E.3
  * Royal Aircraft Factory B.E.4
  * Short School Biplane
  * Short S.32
  * Short S.36
  * Short S.38
  * Short S.45
  * Sopwith Three-Seater
  * Vickers No.6 Monoplane
  * Vickers No.8 Monoplane
  
  ### Gnome 14 Gamma-Gamma
  
  * Royal Aircraft Factory B.E.7
  * Short S.41
  
  ## Specifications (Gnome 7 Gamma)
  
  Data from Lumsden.
  
  ### General characteristics
  
  * Type: 7-cylinder, single-row, rotary engine
  * Bore: 120 mm (4.7 in)
  * Stroke: 130 mm (5.1 in)
  * Displacement: 11.14 L (679.84 cu in)
  * Length: 112.7 cm (44.4 in)
  * Diameter: 86.9 cm (34.2 in)
  
  ### Components
  
  * 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
  
  ### Performance
  
  * Power output: 52.2 kW (70 hp) at 1,200 rpm
  