De Havilland Gipsy Twelve

1930s British piston aircraft engine

Gipsy Twelve/Gipsy King
de Havilland Gipsy King on display at the de Havilland Aircraft Museum
Type Piston V-12 inline aero-engine
Manufacturer de Havilland Engine Company
First run 1937
Major applications de Havilland Don
de Havilland Albatross
Number built 95

The de Havilland Gipsy Twelve was a British aero engine developed by the de Havilland Engine Company in 1937. Approximately 95 were manufactured. It was known as the Gipsy King in Royal Air Force service.

Applications

  • de Havilland DH.91 Albatross
  • de Havilland DH.93 Don

Engines on display

Preserved de Havilland Gipsy Twelve engines are on public display at the following museums:

Specifications (Gipsy King I)

de Havilland Gipsy Twelve at the Science Museum (London)

Data from Lumsden[1]

General characteristics

  • Type: Inverted 60 degree V-12 piston engine
  • Bore: 4.646 in (118 mm)
  • Stroke: 5.512 in (140 mm)
  • Displacement: 1121.3 cu in (18.4 L)
  • Length: 82.6 in (2,098 mm)
  • Width: 31.5 in (800 mm)
  • Height: 37.4 in (950 mm)
  • Dry weight: 1,058 lb (480 kg)

Components

  • Valvetrain: Overhead valve
  • Supercharger: Single speed
  • Fuel type: 87 Octane petrol
  • Cooling system: Air cooled
  • Reduction gear: Spur geared, reduction ratio 0.667:1

Performance

  • Power output: 425 hp at 2,450 rpm at 0 psi boost (five minutes maximum)
  • Compression ratio: 6:1
  • Power-to-weight ratio: 0.4 hp/lb

See also

Comparable engines

Related lists

References

Notes

  1. ^ Lumsden 2003, p.147

Bibliography

  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links

Wikimedia Commons has media related to De Havilland Gipsy Twelve.
  • Photo of a de Havilland Gipsy Twelve at Enginehistory.org
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