Clerget 9B

9B
Preserved Clerget 9B engine on display at the Fleet Air Arm Museum, RNAS Yeovilton.
Type	Rotary engine
National origin	France
Manufacturer	Clerget-Blin
First run	1913
Major applications	Sopwith Camel
Number built	3,650 (British production)
Unit cost	£907.50 (1915)
Developed into	Bentley BR1

The Clerget 9B was 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.

(1913) 130 hp (97 kW). 1,300 produced by Ruston Proctor & Co Ltd of Lincoln

(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.

Data from Lumsden.

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