Bristol Cherub

Cherub
	Preserved Bristol Cherub engine
Type	Piston aircraft engine
Manufacturer	Bristol Aeroplane Company
First run	1923
Major applications	Bristol Brownie; Hawker Cygnet

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.^[1]

Variants

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.^[2]
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.

Applications

Survivors

An airworthy Messerschmitt M17 replica is owned and operated by the EADS Heritage Flight at Manching and is powered by an original Bristol Cherub III.^[3]

Engines on display

A preserved Bristol Cherub is on static display at the Shuttleworth Collection, Old Warden, Bedfordshire.

Specifications (Cherub III)

Data from Lumsden.^[4]

General characteristics

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)

Components

Valvetrain: Overhead valve
Oil system: Dry sump
Cooling system: Air-cooled

Performance

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

References

Notes

^ Guttery 1969, p.80.
^ Lumsden 2003, p.101.
^ EADS - Messerschmitt M17^{[permanent dead link]} Retrieved: 9 August 2009
^ Lumsden 2003, p.102.

Bibliography

Guttery, T.E. The Shuttleworth Collection. London: Wm. Carling & Co, 1969. ISBN 0-901319-01-5
Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links

The Bristol Cherub - Flight, March 1923

Zdroj:https://en.wikipedia.org?pojem=Bristol_Cherub
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[1] Guttery 1969, p.80.

[2] Lumsden 2003, p.101.

[3] EADS - Messerschmitt M17^{[permanent dead link]} Retrieved: 9 August 2009

[4] Lumsden 2003, p.102.

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