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Bristol Cherub


The Bristol Cherub is a British two-cylinder, air-cooled, aircraft engine designed and built by the Bristol Aeroplane Company. Introduced in 1923 it was a popular engine for ultralight and small aircraft in the 1930s.


Cherub I
Initial direct drive version introduced in 1923. Bore and stroke of 3.35 by 3.8 inches (85 mm × 97 mm) for a displacement of 67 cu in (1.095 L). 32 horsepower (24 kW) at 2,500 rpm.

Cherub II
Geared down (2:1) version of the Cherub I.

Cherub III
An improved and slightly larger (1.228 L) direct drive version introduced in 1925.


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Cherub III
Type: 2-cylinder air-cooled, horizontally opposed, left-hand tractor
Bore: 3.54 in (90 mm)
Stroke: 3.8 in (96.5 mm)
Displacement: 75 in³ (1.228 L)
Width: 25.6 in (650 mm)
Dry weight: 98 lb (39.5 kg)
Valvetrain: Overhead valve
Oil system: Dry sump
Cooling system: Air-cooled
Power output: 36 hp (24 kW) at 3,200 rpm
Compression ratio: 5.75:1
Fuel consumption: 2.5 imp. gallons per hour
Power-to-weight ratio: 0.36 hp/lb



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