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Clerget 9B




First run in 1913, the Clerget 9B was a nine-cylinder rotary aircraft engine of the World War I era designed by Pierre Clerget. Manufactured in both Great Britain (Gwynne Limited) and France, it was used on such aircraft as the Sopwith Camel.  The unit cost of the 9B was £907.50 in 1915. British production totalled 3,650.

The Clerget 9Bf was an increased stroke version.

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 lt (1,066.5 cu in). 1,750 produced by Gwynnes Ltd. and 600 produced by Ruston Proctor.



Clerget 9B
Armstrong Whitworth F.K.10
Avro 504
Avro 531
Bristol M.1
Cierva C.6
Cierva C.8
Fairey Hamble Baby
Nieuport 12
Nieuport 17
Nieuport Triplane
Sopwith Baby
Sopwith Camel
Sopwith Scooter
Sopwith Triplane
Sopwith 1½ Strutter

Clerget 9Bf
Sopwith Camel



Clerget 9B
Type: Nine-cylinder air-cooled rotary engine
Bore: 120 mm (4.72 in)
Stroke: 9B: 160 mm (6.30 in), 9Bf: 172 mm (6.77 in)
Displacement: 9B: 16.29 l (994.08 cu in), 9Bf: 17.5 l (1,067.92 cu in)
Length: 920 mm (36.22 in)
Diameter: 9B: 1,020 mm (40.15 in), 9Bf: 1,030 mm (40.55 in)
Dry weight: 173 kg (381 lb)
Valvetrain: Single inlet and exhaust valves operated by pushrods and rockers
Fuel system: Bloctube carburettor
Fuel type: Gasoline mixed with Castor oil lubricant
Oil system: Castor oil mixed with fuel
Cooling system: Air-cooled
Power output: 9B: 96.94 kW (130 hp) at 1,250 rpm, 9Bf: 104.40 kW (140 hp) at 1,250 rpm
Specific power: 9B: 0.1308 hp/cu in (5.953 kW/l), 9Bf: 0.131 hp/cu in (5.966 kW/l)
Compression ratio: 9B: 4.56:1, 9Bf: 5.3:1
Specific fuel consumption: 9B: 0.564 l/kW/hour(0.74 pt/hp/hour), 9Bf: 0.45 l/kW/hour(0.59 pt/hp/hour)
Oil consumption: 9B: 0.0686 l/kW/hour (0.09 0.11 pt/hp/hour), 9Bf: 0.0838 l/kW/hour (0.11 pt/hp/hour)
Power-to-weight ratio: 9B: 0.563 kW/kg (0.341 hp/lb), 9Bf: 0.556 kW/kg (0.337 hp/lb)



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