Clerget 9B

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World War I–era rotary aircraft engine

title: "Clerget 9B" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["air-cooled-aircraft-piston-engines", "1910s-aircraft-piston-engines", "clerget-aircraft-engines", "rotary-aircraft-piston-engines"] description: "World War I–era rotary aircraft engine" topic_path: "general/air-cooled-aircraft-piston-engines" source: "https://en.wikipedia.org/wiki/Clerget_9B" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary World War I–era rotary aircraft engine ::

::data[format=table title="infobox aero engine"]

FieldValue
name9B
imageClerget 9B FAAM.JPG
captionPreserved Clerget 9B engine on display at the Fleet Air Arm Museum, RNAS Yeovilton.
engine_typeRotary engine
national_originFrance
manufacturerClerget-Blin
first_run1913
major_applicationsSopwith Camel
number_built6,500 (French production)
3,650 (British production)
developed_intoBentley BR1
::

|name= 9B |image = Clerget 9B FAAM.JPG |caption = Preserved Clerget 9B engine on display at the Fleet Air Arm Museum, RNAS Yeovilton. |engine_type= Rotary engine |national_origin = France |manufacturer= Clerget-Blin |first_run=1913 |major_applications= Sopwith Camel |number_built = 6,500 (French production) 3,650 (British production) |developed_from = |developed_into = Bentley BR1 |variants_with_their_own_articles =

The Clerget 9B is a nine-cylinder rotary aircraft engine of the World War I era designed by Pierre Clerget. Manufactured in both France and Great Britain (Gwynnes Limited), it was used on such aircraft as the Sopwith Camel. The Clerget 9Bf was an increased stroke version.

Variants

;Clerget 9B (1913) 130 hp (97 kW). 1,300 produced by Ruston Proctor & Co Ltd of Lincoln ;Clerget 9Bf (1915) 140 hp (104 kW). Extended stroke 172 mm (6.75 in) version, increasing capacity to 17.5 L (1,066.5 cu in). 1,750 produced by Gwynnes Limited and 600 produced by Ruston Proctor.

Applications

Clerget 9B

::figure[src="https://upload.wikimedia.org/wikipedia/commons/d/dc/Sopwith_Strutter_RAFM.jpg" caption="Clerget 9B powered [[Sopwith 1½ Strutter]] on display at the [[Royal Air Force Museum London"] ::

Clerget 9Bf

Engines on display

Operational (Airworthy) Rotary Engines

The Shuttleworth Collection based at Old Warden Aerodrome, UK, operate an airworthy late production Sopwith Triplane (G-BOCK) fitted with an original 9B as well as an airworthy late production Sopwith Camel (G-BZSC) fitted with an original long-stroke 9Bf. These aircraft can be seen displaying at home air displays through the summer months.

Specifications (Clerget 9B)

::figure[src="https://upload.wikimedia.org/wikipedia/commons/f/fc/Clerget_9B_RAFM.jpg" caption="Clerget 9B"] ::

and start a new, fully-formatted line with -- |ref=Lumsden. |type=Nine-cylinder air-cooled rotary engine |bore=120 mm |stroke=160 mm |displacement=16.29 L |length=36.22 in |diameter=40.15 in |width= |height= |weight=381 lb |valvetrain=Single inlet and exhaust valves operated by pushrods and rockers |supercharger= |turbocharger= |fuelsystem=Bloctube carburettor |fueltype=Gasoline mixed with Castor oil lubricant |oilsystem=Castor oil mixed with fuel |coolingsystem=Air-cooled |power=130 hp at 1,250 rpm |specpower=0.1308 hp/cu in (5.953 kW/L) |compression=4.56:1 |fuelcon= |specfuelcon=0.564 L/kW/hour(0.74 pt/hp/hour) |oilcon=0.0686 L/kW/hour (0.09 pt/hp/hour) |power/weight=0.563 kW/kg (0.341 hp/lb)

References

Notes

Bibliography

  • Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. .

References

  1. Hartmann, Gerard. (2003). "La société des moteurs Clerget".
  2. Lumsden 2003, p. 133.
  3. [http://www.powerhousemuseum.com/collection/database/?irn=206765 Powerhouse Museum - Clerget 9Bf] Retrieved: 12 November 2010.
  4. [http://www.shuttleworth.org/collection/sopwithtriplane/ The Shuttleworth Collection - Sopwith Triplane] Retrieved: 21 August 2018
  5. [http://www.shuttleworth.org/collection/sopwithcamel/ The Shuttleworth Collection - Sopwith Camel] Retrieved: 21 August 2018
  6. Grey, C.G.. (1969). "Jane's All the World's Aircraft 1919". David & Charles (Publishing) Limited.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

air-cooled-aircraft-piston-engines1910s-aircraft-piston-enginesclerget-aircraft-enginesrotary-aircraft-piston-engines