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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

• Royal Aircraft Factory B.E.7
• Short S.41

Data from Lumsden.^[1]

• 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)

• 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

Comparable engines

• Anzani 10-cylinder
• Clerget 7Z
• Le Rhône 9C

Related lists

• List of aircraft engines

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