ABC 8 hp

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8 hp
ABC 8 hp installed in the English Electric Wren at the Shuttleworth Collection
Type Flat-twin aero engine
National origin United Kingdom
Manufacturer ABC Motors Limited
Designed by Granville Bradshaw
First run 1923

The ABC 8 hp is an 8 hp (6 kW) two-cylinder aero engine designed by the noted British engineer Granville Bradshaw for use in ultralight aircraft. The engine was derived from a specially tuned motorcycle unit and was built by ABC Motors, first running in 1923.[1]



The sole surviving English Electric Wren (G-EBNV) flies occasionally at the Shuttleworth Collection at Old Warden and is powered by an ABC 8 hp engine. With barely enough power to maintain flight the aircraft is assisted into the air by a team of volunteers using bungee cord, after which the Wren lands straight ahead following a short 'hop'.[2]

Specifications (ABC 8 hp)[edit]

Data from Lumsden[3]

General characteristics

  • Type: 2-cylinder air-cooled flat-twin
  • Bore: 2.72 in (69 mm)
  • Stroke: 2.13 in (54 mm)
  • Displacement: 24.76 cu in (404 cc)
  • Dry weight: 41 lb (18.6 kg)


  • Valvetrain: Overhead valve, two valves per cylinder
  • Fuel system: Carburettor
  • Fuel type: Petrol
  • Cooling system: Air-cooled


See also[edit]

Related development
Comparable engines
Related lists



  1. ^ Lumsden 2003, p.51.
  2. ^ The Shuttleworth Collection - English Electric Wren Retrieved: 7 February 2009
  3. ^ Lumsden 2003, p.54.


  • Guttery, T.E. The Shuttleworth Collection of historic aeroplanes, cars, cycles, carriages and fire engines. Biggleswade, Bedfordshire: The Collection, 1969. ISBN 978-0-901319-01-2
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links[edit]