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Gnome Omega
Gnome 7 Omega / 50 hp
Gnome 14 Omega-Omega / 100 hp


Gnome 7 Omega


The Gnome 7 Omega (commonly called the Gnome 50 hp) is a French seven-cylinder, air-cooled aero engine. It was shown at the Paris Aero Salon held in December 1908 and was first flown in 1909. The unit cost in 1909 was £520.

It was the world's first rotary engine produced in quantity, and its introduction revolutionized the aviation industry and it was used by many early aircraft. 4,000 had been produced until 1914 (more later). It produced 50 horsepower (37 kW) from its capacity of 8 litres (488 cubic inches).

A Gnome Omega engine powers the 1912 Blackburn Monoplane, owned and operated by the Shuttleworth Collection, the oldest known airworthy British-designed aeroplane worldwide.

A two-row version of the same engine was also produced, known as the Gnome 14 Omega-Omega or Gnome 100 hp. The prototype Omega engine still exists, and is on display at the United States' National Air and Space Museum.
Gnome 7 Omega
Single-row 7-cyl. original version; 50 hp (37 kW).
Gnome 14 Omega-Omega
Two-row, 14-cylinder version using Omega cylinders; 100 hp (75 kW).



Gnome 7 Omega

Avro Type 500
Blackburn Mercury
Blackburn Monoplane
Blériot XI
Bristol Boxkite
Bristol Racing Biplane
Bristol Monoplane
Bristol-Prier P.1
Bristol-Coanda School Monoplane
Bristol-Coanda T.B.8
Burga Monoplane
Fabre Hydravion
Henry Farman Type Militaire
Grahame-White School Biplane
Koolhoven Heidevogel
Nieuport Monoplane
Paulhan Biplane
Pemberton-Billing P.B.9
Royal Aircraft Factory B.E.3
Royal Aircraft Factory B.E.4
Royal Aircraft Factory F.E.2
Short S.27
Short Tandem Twin
Short S.37 Tractor Monoplane
Short Triple Twin
Short S.47 Triple Tractor
Short S.62
Sopwith Bee
Sopwith Sparrow
Valkyrie Type B
Vickers No.6 Monoplane
Vickers No.7 Monoplane
Vickers Boxkite School Biplane


Gnome 14 Omega-Omega

Bristol Gordon England G.E.2
Coventry Ordnance Works Biplane 10
Nieuport Monoplane
Short S.41 Tractor Biplane
Short S.57 Seaplane
Short S.64 Folder Seaplane
Short S.74 Admiralty Seaplane



7 Omega
Type: 7-cylinder, single-row, rotary engine
Bore: 110 mm (4.3 in)
Stroke: 120 mm (4.7 in)
Displacement: 8 L (488.5 cu in)
Length: 79 cm (31 in)
Diameter: 84 cm (33 in)
Dry weight: 75 kg (165 lb)
Valvetrain: pressure-driven inlet valves were located on the pistons
Oil system: Total loss, castor oil
Cooling system: Air-cooled
Reduction gear: Direct drive, right-hand tractor, left-hand pusher
Power output: 37 kW (50 hp) at 1,200 rpm



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