Clerget 9B

Aircraft Engines - SOLD

We are proud to present to the market a Clerget 9B rotary aircraft engine with serial number 22500. Fitted with two PLR Magnetos and an Air pump, an oil pump, Kauper gun gear. The engine is offered in museum quality condition and presented on a purpose-built engine stand. 
Clerget-Blin was a French precision engineering company formed in 1913 by the engineer and inventor Pierre Clerget and industrialist Eugène Blin. The Clerget-Blin company mainly produced aircraft engines. Their successful rotary engine designs were also built in Britain by companies such as Gwynnes Limited, Ruston Proctor and Gordon Watney, to increase the output in the times of World War I.       Gwynnes Limited was a City of London England engineering business, iron founders and pump makers founded in 1849. During the First World War, Gwynnes workshops made Clerget rotary aircraft engines. The Clerget 9B was a nine-cylinder rotary aircraft engine of the World War I era manufactured in both France and Great Britain.


General characteristics
Type: Nine-cylinder air-cooled rotary engine
Bore: 120 mm (4.72 in)
Stroke: 9B: 160 mm (6.30 in)
Displacement: 9B: 16.29 l (994.08 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

On closer inspection it was established that this particular engine is a Long Stroke 140 hp version. 
Specific power: 9B: 0.1308 hp/cu in (5.953 kW/l)
Compression ratio: 9B: 4.56:1
Specific fuel consumption: 9B: 0.564 l/kW/hour(0.74 pt/hp/hour)
Oil consumption: 9B: 0.0686 l/kW/hour (0.09 pt/hp/hour)
Power-to-weight ratio: 9B: 0.563 kW/kg (0.341 hp/lb)


Major Applications: 
Armstrong Whitworth F.K.10
Avro 504
Avro 531
Bristol M.1
Cierva C.6
Cierva C.8
Fairey Hamble Baby
FBA Type C
Nieuport 12
Nieuport 17bis                                                                                   Application -Sopwith Camel
Sopwith Baby
Sopwith Camel
Sopwith Scooter
Sopwith Triplane
Sopwith 1½ Strutter

Contact  Allan Vogel on +44(0)776 993 4646 or email 


Price on Application

Clerget 9B front
Clerget 9B front

Clerget 9B Aero Engine

Clerget 9B Plate Engine No
Clerget 9B Plate Engine No
Clerget 9B Interrupter Gear
Clerget 9B Interrupter Gear
Clerget 9B rear
Clerget 9B rear
Clerget 9B Magnetos
Clerget 9B Magnetos
Clerget 9B side
Clerget 9B side
Clerget 9B Prop Hub removed
Clerget 9B Prop Hub removed
Clerget 9B Bearing
Clerget 9B Bearing