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ABC Wasp
	The WASP engine
Type	Radial
National origin	England
Manufacturer	ABC Motors
Designed by	Granville Bradshaw
First run	1916
Number built	56

The ABC Wasp was an experimental 170 hp (127 kW) seven-cylinder radial engine designed by the noted British engineer Granville Bradshaw, and primarily built by ABC Motors Limited. Twelve experimental ABC Wasp engines were delivered to Guy Motors on 19 April 1918.^[1]

[edit] Design and development

The ABC Wasp was one of the first large stationary air-cooled radials. At a weight of 290 pounds (131 kg), it had a reasonable power-to-weight ratio at 0.6 horsepower per pound. This World War I–era engine is noteworthy because it was one of the first in which the cylinders were coated with copper in an attempt to dissipate heat. The ABC Wasp never evolved beyond the experimental stage, but it was the predecessor of the unsuccessful Dragonfly engine.^[2]^[3]

[edit] Variants

Wasp I: 1918, 160 hp (119 kW)
Wasp II: 1919, 200 hp (149 kW), increased bore and stroke.

[edit] Applications

Wasp I

Wasp II

[edit] Specifications (Wasp I)

Data from Lumsden^[4]

General characteristics

Type: 7 cylinder air cooled radial
Bore: 4.53 in (115 mm)
Stroke: 5.9 in (150 mm)
Displacement: 667.1 cu in (10.78 L)
Diameter: 42 in (1,067 mm)
Dry weight: 290 lb (131 kg)

Components

Fuel system: 2 Claudel-Hobson Carburettors
Fuel type: 40-50 octane petrol
Cooling system: Air cooled

Performance

Power output: 185hp (138 kW) at 1,750 rpm
Compression ratio: 4.05:1
Power-to-weight ratio: 0.63 hp/lb (1.05 kW/kg)

[edit] See also

The ABC Wasp on display.

Related development

ABC Dragonfly

Related lists

List of aircraft engines

[edit] References

[edit] Notes

^ "Aircraft Component Manufacturers - Guy Motors". http://www.localhistory.scit.wlv.ac.uk/Museum/Transport/planes/components.htm. Retrieved 2008-12-23.
^ "Fact Sheets : British ABC Wasp : British ABC Wasp". http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=816. Retrieved 2008-12-23.
^ "OLD RHINEBECK AERODROME - ABC Wasp". http://www.oldrhinebeck.org/collection/engines/ABC%20Wasp.htm. Retrieved 2008-12-23.
^ Lumsden 2003, p.52.

[edit] Bibliography

Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. pp. 9.
Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

[edit] External links

Wikimedia Commons has media related to: ABC aircraft engines

[Aircraft_Component_Manufacturers_-_Guy_Motors-0] "Aircraft Component Manufacturers - Guy Motors". http://www.localhistory.scit.wlv.ac.uk/Museum/Transport/planes/components.htm. Retrieved 2008-12-23.

[British_ABC_Wasp-1] "Fact Sheets : British ABC Wasp : British ABC Wasp". http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=816. Retrieved 2008-12-23.

[ABC_Wasp-2] "OLD RHINEBECK AERODROME - ABC Wasp". http://www.oldrhinebeck.org/collection/engines/ABC%20Wasp.htm. Retrieved 2008-12-23.

[3] Lumsden 2003, p.52.

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