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The de Havilland Gipsy Major Aircraft Engine

The de Havilland Gipsy Major (a.k.a. Gipsy III) was the first version of the Gipsy inline 4 cylinder air-cooled aero-engine designed to be run inverted, there were advantages and disadvantages in doing this, it gave the pilot an unobstructed forward view, especially helpful on take-off and landings, but at the cost of higher oil consumption and potential for oil fouling of the spark plugs.

de Havilland Gipsy Major Aircraft Engine


The de Havilland Gipsy Major was introduced in 1932 and after modifications to the piston rings to alleviate the oil problem proved to be very successful, a total of 14,615 engines being built. The most impotent use of the de Havilland Gipsy Major was probably it's use in the RAF's main trainer leading up to ww2, the Tiger Moth. Many, if not most of the RAF's pilots learnt their basic skills whilst sitting behind a de Havilland Gipsy Major aero-engine.

Aircraft that were powered by the de Havilland Gipsy Major

Airspeed Ferryde Havilland Hornet MothMiles Magister
AISA I-115de Havilland Leopard MothMiles Mercury
Arrow Activede Havilland Moth MajorMiles Messenger
Auster Aigletde Havilland Puss MothMiles Minor
Auster Autocarde Havilland Tiger MothMiles Monarch
Auster Autocratde Havilland T.K.2Miles Sparrowhawk
Beagle Terrierde Havilland T.K.4Miles Whitney Straight
Boulton Paul P.92Elliotts Newbury EonPercival Gull Major
British Aircraft CupidFairey PrimerReid and Sigrist Desford
British Aircraft EagleFoster Wikner WickoRogozarski SIM-Х
British Aircraft Double EagleGeneral Aircraft Cygnet MajorRWD-5bis
Blackburn B-2General Aircraft MonosparRWD-19
Chrislea Super AceHandley Page ManxSaab 91 Safir
Comper MouseHirtenberg HS.9Saunders-Roe Skeeter
Comper StreakIkarus Aero 2Stampe SV.4
Comper SwiftKoolhoven F.K.43Thruxton Jackaroo
De Bruyne SnarkMiles AerovanVL Viima
de Havilland DragonMiles Falcon MajorAuster 6A Tugmaster
de Havilland DragonflyMiles Geminide Havilland Chipmunk T.10
de Havilland Australia DroverMiles Hobby 
DHC-1 ChipmunkMiles Hawk Trainer 
de Havilland Fox MothMiles Libellula 

de Havilland Gipsy Major I Specifications:

  • Type: 4-cylinder OHV air-cooled inverted inline piston aircraft engine
  • Bore: 4.646 in (118 mm)
  • Stroke: 5.512 in (140 mm)
  • Displacement: 373.7 in³ (6.124 L)
  • Length: 48.3 in (1227 mm)
  • Width: 20.0 in (508 mm)
  • Height: 29.6 in (752 mm)
  • Dry weight: 300 lb (136 kg) Mk 1F to 322 lb (146 kg) Mk 1D
  • Fuel system: Downdraught Hobson A.I.48 H3M (Mk 1C and Mk 7) or H1M
  • Oil system: Dry sump, gear-type pump
  • Cooling system: Air-cooled
  • Power output: 122 hp at 2,100 rpm, 145 hp (108 kW) at 2,550 rpm
  • Specific power: 0.39 hp/in³ (17.6 kW/L)
  • Compression ratio: 5.25:1 (Mk 1 and 1F) or 6.0:1 (others)
  • Fuel consumption: 6.5 to 6.75 gph (28.4 to 30.7 L/h) at 2,100 rpm
  • Oil consumption: 1.75 pints (0.99 L) per hour.
  • Power-to-weight ratio: 0.48 hp/lb (0.78 kW/kg)

    de Havilland Gipsy III

    de Havilland Gipsy III

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