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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 80 horsepower (60 kW) from its capacity of 12 litres (730 cubic inches) although recorded figures are lower.[1]

Lambda
Gnome 7 Lambda as shown in a 1913 Gnome catalog
Type Rotary aero engine
Manufacturer Gnome et Rhône
First run c.1911
Major applications Avro 504
Bristol Boxkite
Bristol Scout
Number built 979 (British production)

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 145 mm (5.71 in) to raise the compression ratio to 3.87:1, and total displacement to 12.26 litres (748 cu in).
Gnome 14 Double Lambda
14-cylinder, two-row rotary engine using Lambda cylinders. 160 hp (120 kW).
Motorenfabrik Oberursel U.0
German production of the Gnome 7 Lambda – had a 124 mm (4.88 in) cylinder bore and 140 mm (5.51 in) piston stroke for a total displacement of 11.52 litres (703 cu in), external diameter of 1.020 metres (40.16 in).[2]
Motorenfabrik Oberursel U.III
:German production of the Gnome 14 Double Lambda

Applications


List from Lumsden

The Sopwith Tabloid replica on display at the Royal Air Force Museum is fitted with an original Gnome 7 Lambda[clarification needed] engine.
The Sopwith Tabloid replica on display at the Royal Air Force Museum is fitted with an original Gnome 7 Lambda[clarification needed] engine.

Gnome 7 Lambda



Gnome 14 Lambda-Lambda



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.[4]


Specifications (Gnome 7 Lambda)


Oberursel U.III, a copy of the 14-cylinder Gnome Lambda-Lambda
Oberursel U.III, a copy of the 14-cylinder Gnome Lambda-Lambda

Data from Lumsden.[1]

General characteristics

Components

Performance


See also


Comparable engines

Related lists


References



Notes



Bibliography



На других языках


- [en] Gnome Lambda

[it] Gnome Lambda

Lo Gnome 7 Lambda era un motore aeronautico rotativo a sette cilindri raffreddati ad aria, sviluppato dall'azienda francese Société Des Moteurs Gnome e prodotto, oltre che in Francia dalla successiva realtà aziendale Gnome et Rhône, su licenza anche nel Regno Unito, negli anni dieci del XX secolo.

[ru] Гном Lambda

Гном 7 Lambda (в профильной литературе также Gnome Λ, Gnome 80 hp, Гном-80) — французский 7-цилиндровый ротативный авиадвигатель воздушного охлаждения, выпускавшийся по лицензии в Великобритании, Германии и России. Устанавливался на нескольких десятках типов самолётов периода Первой мировой войны. Согласно информации производителя, при рабочем объёме в 12 литров он развивал мощность до 80 л. с. (60 кВт), однако, результаты испытаний показали, что эта цифра была несколько завышена.[1]



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