The Gnome 7 Lambda was a French designed, seven-cylinder, air-cooled rotary aero engine that was produced under license in Britain and Germany. Powering several World War I-era aircraft types it was claimed to produce from its capacity of although recorded figures are lower. Just under 1,000 units were produced in Britain, the majority (967) by the Daimler Company of Coventry. A 14-cylinder variant was known as the Gnome 14 Lambda-Lambda. In Germany Motorenfabrik Oberursel license-built the seven-cylinder engine as the Oberursel U.0 and later copied the 14-cylinder design and designated it as the Oberursel U.III. Variants Gnome 7 Lambda Seven-cylinder, single-row rotary engine. Gnome 7 Lambda (long stroke) Increased stroke of to raise the compression ratio to 3.87:1, and total displacement to . Gnome 14 Double Lambda 14-cylinder, two-row rotary engine using Lambda cylinders. . Motorenfabrik Oberursel U.0 German production of the Gnome 7 Lambda – had a cylinder bore and piston stroke for a total displacement of , external diameter of . Motorenfabrik Oberursel U.III :German production of the Gnome 14 Double Lambda Applications List from Lumsden Gnome 7 Lambda Avro 504 Blackburn Type I Borel hydro-monoplane Blériot Parasol Blériot XI Bristol Boxkite Bristol Gordon England G.E.3 Bristol-Coanda Monoplanes Bristol Coanda T.B.8 Bristol Coanda P.B.8 Bristol Scout Caudron G.III Deperdussin Type B Dunne D.8 Henry Farman F.20 Grahame-White Type XV London & Provincial 4 Lowe Marlburian Nieuport IVG Nieuport 10 Nieuport-Macchi Parasol Radley-England Waterplane Royal Aircraft Factory B.E.3 Royal Aircraft Factory B.E.4 Royal Aircraft Factory B.E.8 Royal Aircraft Factory B.S.1 Royal Aircraft Factory S.E.2 Royal Aircraft Factory S.E.2 Royal Aircraft Factory S.E.4 Short S.37 Short S.38 Short S.41 Short S.60 Short S.70 Sikorsky S-7 Sopwith Gordon Bennett Racer Sopwith Pup Sopwith Sociable Sopwith Tabloid Sopwith Three-Seater Vickers No.8 Monoplane Gnome 14 Lambda-Lambda Avro 510 Royal Aircraft Factory S.E.4 Deperdussin Monocoque Fokker D.III Fokker E.IV Paul Schmitt P.S.3 Short S.63 Short S.64 Short S.70 Short S.74 Short S.80 Short S.81 Short S.82 Survivors An original Gnome 7 Lambda engine is installed in the Sopwith Tabloid replica aircraft on display in the Grahame-White hall of the Royal Air Force Museum London. Specifications (Gnome 7 Lambda) See also References Notes Bibliography Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. . Air-cooled aircraft piston engines 1910s aircraft piston engines Lambda Rotary aircraft piston engines