Gnome Lambda
| {{Infobox Aircraft Begin
| name = Lambda | image = Gnome Lambda - Moteurs Gnome October 1913.png | caption = Gnome 7 Lambda as shown in a 1913 Gnome catalog }} {{Infobox Aircraft Engine |type= Rotary aero engine |national origin = |manufacturer= Gnome et Rhône |first run= c.1911 |major applications=Avro 504 |number built =2,720 (French production) |program cost = |unit cost = |developed from = |developed into = |variants with their own articles = }} |
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 {{convert|80|hp|kW|lk=in}} from its capacity of {{convert|12|L|cuin|abbr=off}} 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 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 {{cvt|145|mm|in|2}} to raise the compression ratio to 3.87:1, and total displacement to {{convert|12.26|L|cuin}}.
;Gnome 14 Double Lambda
:14-cylinder, two-row rotary engine using Lambda cylinders. {{cvt|160|hp|kW}}.
;Motorenfabrik Oberursel U.0
:German production of the Gnome 7 Lambda – had a {{cvt|124|mm|in|2}} cylinder bore and {{cvt|140|mm|in|2}} piston stroke for a total displacement of {{convert|11.52|L|cuin}}, external diameter of {{convert|1.020|m|in|2}}.{{cite web |url=http://forum.valka.cz/viewtopic.php/t/124238 |title=Obsah fóra :: Zbraně a vybavení :: Výzbroj, zbraňové systémy, vybavení a příslušenství :: Motory :: Letecké motory :: Pístové :: Německo (DEU) :: Oberursel U.0 |author= |website=valka.cz |date=24 January 2012 |language=cs |access-date=July 19, 2013}}
;Motorenfabrik Oberursel U.III: German production of the Gnome 14 Double Lambda
Applications
List from Lumsden
File:Sopwith Tabloid RAFM.jpg replica on display at the Royal Air Force Museum is fitted with an original Gnome 7 Lambda{{clarify|date=May 2011|reason=The Sopwith Tabloid article says it was produced only with Monospaupe engines. Is Lambda an alternate name for these? Or maybe it is a customization specific only to this replica?}} engine.]]
=Gnome 7 Lambda=
{{div col|colwidth=22em}}
- Avro 504
- Blackburn Type I
- Borel hydro-monoplane{{cite journal|journal=Flight|url=http://www.flightglobal.com/pdfarchive/view/1913/1913%20-%200430.html|title=The Borel Hydro-Monoplane |date=19 July 1913|page=450}}
- 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
- Farman HF.14
- Farman HF.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
{{div col end}}
=Gnome 14 Lambda-Lambda=
{{div col|colwidth=22em}}
- Avro 510
- Royal Aircraft Factory S.E.4
- Deperdussin Monocoque
- Farman HF.19
- 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
{{div col end}}
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.[https://web.archive.org/web/20101223040443/http://www.rafmuseum.org.uk/london/collections/aircraft/aircraft-history/83-A-526%20Tabloid%20168.pdf RAF Museum – Sopwith Tabloid replica history] Retrieved: 11 November 2010.
Specifications (Gnome 7 Lambda)
{{pistonspecs|
|type=7-cylinder, single-row, rotary engine
|bore={{cvt|124|mm|in}}
|stroke={{cvt|140|mm|in}}
|displacement={{cvt|11.8|L|cuin}}
|length={{cvt|112|cm|in}}
|diameter={{cvt|93|cm|in}}
|width=
|height=
|weight={{cvt|96|kg|lb}}
|valvetrain=Automatic centre-piston inlet valve, overhead exhaust valve (one each per cylinder)
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=
|oilsystem=
|coolingsystem=Air-cooled
|power={{cvt|50.3|kW|hp}} at 1,250 rpm (maximum power)
|specpower=
|compression=3.75:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=
|reduction_gear=Direct drive, right-hand tractor, left-hand pusher
}}
See also
{{aircontent
|see also=
|related=
|similar aircraft=
|lists=
|similar engines=
}}
References
{{Commons category multi|Gnome Lambda|Gnome Lambda-Lambda}}
=Notes=
{{reflist}}
=Bibliography=
{{refbegin}}
- Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. {{ISBN|1-85310-294-6}}.
{{refend}}
{{Gnome-Rhône aeroengines}}
{{Oberursel aeroengines}}
Category:Air-cooled aircraft piston engines