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Oberursel U.III


Oberursel U.III


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 (720 cubic inches) although recorded figures are lower.


Gnome 7 Lambda


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.


Gnome 7 Lambda


Gnome 7 Lambda
Seven-cylinder, single-row rotary engine.
Gnome 7 Lambda (long stroke)
Increased stroke of 145 mm (5.7 in) to raise the compression ratio to 3.87:1, and total displacement to 12.26 litres.
Gnome 14 Lambda-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 124mm cylinder bore and 140mm piston stroke for a total displacement of 11.52 litres, external diameter of 1.020 meters.



Gnome 7 Lambda
Avro 504
Blackburn Type I
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 G.W.15
L & P 4
Lowe Marlburian
Nieuport IVG
Nieuport 10
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
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
Short S.63
Short S.64
Short S.70
Short S.74
Short S.80
Short S.81
Short S.82



Gnome 7 Lambda
Type: 7-cylinder, single-row, rotary engine
Bore: 124 mm (4.9 in)
Stroke: 140 mm (5.5 in)
Displacement: 11.8 L (721.2 cu in)
Length: 112 cm (44 in)
Diameter: 93 cm (36.6 in)
Dry weight: 96 kg (212 lb)
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: 50.3 kW (67.5 hp) at 1,250 rpm (maximum power)
Compression ratio: 3.75:


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