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Clerget 7Z


The Clerget 7Z was a seven-cylinder rotary aircraft engine of the World War I era designed by Pierre Clerget. First run in 1911 it was nominally rated at 80 horsepower (60 kW). 347 examples were jointly built in Britain by Gordon Watney & Co Ltd of Weybridge and Gwynnes Ltd of Hammersmith.
Avro 504
Beardmore W.B.III
Bristol Scout
Grahame-White 20
Royal Aircraft Factory B.E.8
Royal Aircraft Factory S.E.2
Royal Aircraft Factory S.E.4
Sopwith Pup



Clerget 7Z
Type: Seven-cylinder air-cooled rotary engine
Bore: 120 mm (4.72 in)
Stroke: 150 mm (5.91 in)
Displacement: 11.88 l (724.96 cu in)
Diameter: 914 mm (35.98 in)
Dry weight: 106 kg (234 lb)
Valvetrain: 1 each overhead inlet and exhaust valves operated by pushrods and rockers
Fuel system: Bloctube carburettor
Fuel type: Gasoline with Castor oil lubricant
Oil system: Castor oil mixed with fuel
Cooling system: Air-cooled
Power output: 70.84 kW (95 hp) at 1,300 rpm (maximum power)
Specific power: 0.1314 hp/cu in (5.98 kW/l)
Compression ratio: 4.3:1
Specific fuel consumption: 0.564 l/kW/hour(0.74 pt/hp/hour)
Oil consumption: 0.0762 l/kW/hour (0.1 pt/hp/hour)
Power-to-weight ratio: 0.67 kW/kg (0.406 hp/lb)



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