The Gnome 7 Lambda was a French designed, seven-cylinder,

air-cooled Air-cooled engines rely on the circulation of air directly over heat dissipation fins or hot areas of the engine to cool them in order to keep the engine within operating temperatures. Air-cooled designs are far simpler than their liquid-cooled ...

rotary

aero engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Aircraft using power components are referred to as powered flight. Most aircraft engines are either piston engines or gas turbin ...

that was produced under license in Britain and Germany. Powering several

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

-era aircraft types it was claimed to produce from its capacity of although recorded figures are lower.Lumsden 2003, p. 151. Just under 1,000 units were produced in Britain, the majority (967) by the

Daimler Company The Daimler Company Limited ( ), before 1910 known as the Daimler Motor Company Limited, was an independent British motor vehicle manufacturer founded in London by Harry John Lawson, H. J. Lawson in 1896, which set up its manufacturing bas ...

Coventry Coventry ( or rarely ) is a City status in the United Kingdom, cathedral city and metropolitan borough in the West Midlands (county), West Midlands county, in England, on the River Sherbourne. Coventry had been a large settlement for centurie ...

. A 14-cylinder variant was known as the Gnome 14 Lambda-Lambda. In Germany

Motorenfabrik Oberursel Motorenfabrik Oberursel A.G. was a German manufacturer of automobile, locomotive and aircraft engines situated in Oberursel (Taunus), near Frankfurt (Main), Germany. During World War I it supplied a major 100 hp-class rotary engine that was u ...

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 Stroke is a medical condition in which poor cerebral circulation, blood flow to a part of the brain causes cell death. There are two main types of stroke: brain ischemia, ischemic, due to lack of blood flow, and intracranial hemorrhage, hemor ...

of to raise the

compression ratio The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine. A fundamental specification for such engines, it can be measured in two different ways. Th ...

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'' Sopwith Tabloid RAFM

Gnome 7 Lambda

Avro 504 The Avro 504 is a single-engine biplane bomber made by the Avro, Avro aircraft company and under licence by others. Production during World War I totalled 8,970 and continued for almost 20 years, making it the most-produced aircraft of any kind ...

* Blackburn Type I * Borel hydro-monoplane * Blériot Parasol *

Blériot XI The Blériot XI is a French aircraft from the Aviation in the pioneer era, pioneer era of aviation. The first example was used by Louis Blériot to make the first flight across the English Channel in a heavier-than-air aircraft, on 25 July 1909. ...

* 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 * Farman HF.14 * Farman HF.20 * Grahame-White Type XV * London & Provincial 4 * Lowe Marlburian * Nieuport IVG *

Nieuport 10 The Nieuport 10 (or Nieuport XB in contemporary sources) is a French First World War sesquiplane that filled a wide variety of roles, including reconnaissance, fighter and trainer. Design and development In January 1914, designer joined the '' ...

* 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 The Sopwith Pup is a British single-seater biplane fighter aircraft built by the Sopwith Aviation Company. It entered service with the Royal Naval Air Service and the Royal Flying Corps in the autumn of 1916. With pleasant flying characteristi ...

* 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 The Deperdussin Monocoque was an early racing aircraft built in 1912 by the Aéroplanes Deperdussin, a French aircraft manufacturer started in 1911 and reorganized as the Société Pour L'Aviation et ses Dérivés ( SPAD) in 1913. It is so nam ...

* Farman HF.19 *

Fokker D.III The Fokker D.III (Fokker designation M.19) was a German single-seat fighter aircraft of World War I. It saw limited frontline service before being withdrawn from combat in December 1916. Design and development The M.19 began as an effort to imp ...

* 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 Grahame-White was an early British aircraft manufacturer, flying school and later manufacturer of cyclecars. The company was established as ''Grahame-White Aviation Company'' by Claude Grahame-White at Hendon in 1911. The firm built mostly aircra ...

hall of the Royal Air Force Museum London.RAF Museum – Sopwith Tabloid replica history
Retrieved: 11 November 2010.

Specifications (Gnome 7 Lambda)

References

Notes

Bibliography

* Lumsden, Alec. ''British Piston Engines and their Aircraft''. Marlborough, Wiltshire: Airlife Publishing, 2003. . {{Oberursel aeroengines Air-cooled aircraft piston engines 1910s aircraft piston engines

Lambda Lambda (; uppercase , lowercase ; , ''lám(b)da'') is the eleventh letter of the Greek alphabet, representing the voiced alveolar lateral approximant . In the system of Greek numerals, lambda has a value of 30. Lambda is derived from the Phoen ...

Rotary aircraft piston engines