Aircraft Type Index

Aircraft Engine index



The Wright R-1820 Cyclone Aircraft Engine

The Wright R-1820 Cyclone was a nine cylinder radial engine produced between 1931 and 1955, it powered many allied aircraft in WW2 and many of the post war airliners. The Wright R-1820 Cyclone was built under licence in the US by Lycoming and Studebacker, in the Soviet Union by Shvetsov OKB as the M-25 and also in Spain by Hispano-Suiza as the V9.

Wright R-1820 Cyclone Aircraft Engine


There were numerous versions of the Wright R-1820 Cyclone producing from 575 hp (429 kW) when first introduced to 1,525 hp (1,137 kW) on supercharged engines with a water-methanol emergency power boost system, there also was a R-1820 Cyclone 450 hp Diesel version built by Caterpillar Inc. for the WW2 M4A6 Sherman tank.

Aircraft that were powered by the Wright R-1820 Cyclone

Boeing B-17 Flying FortressBoeing 307Brewster F2A Buffalo
Curtiss Model AT-32-A CondorCurtiss SBC HelldiverCurtiss P-36 Mohawk
Curtiss SC SeahawkCurtiss-Wright CW-21Douglas A-33
Douglas B-18Douglas DC-2Douglas DC-3 (DST, G-102/202)
Douglas A-24 BansheeDouglas C-39 
Douglas DC-5Douglas SBD DauntlessFMA AeMB.2 Bombi
General Motors FM-2 WildcatGrumman FF-1Grumman HU-16 Albatross
Grumman J2F DuckGrumman S-2 TrackerLockheed 14
Lockheed LodestarLockheed HudsonMartin B-10
North American NA-44North American O-47North American P-64
North American T-28 TrojanNorthrop YC-125 Raider 
North American T-28 FennicPiasecki H-21Polikarpov I-16
Ryan FR FireballSikorsky H-34Vertol CH-21B Workhorse

Wright R-1820 Cyclone GR-1820-G2 Specifications:

  • Type: Nine-cylinder single-row supercharged air-cooled radial engine
  • Bore: 6.125 in (155.6 mm)
  • Stroke: 6.875 in (174 mm)
  • Displacement: 1,823 in (29.88 litre)
  • Length: 47.76 in (1,213 mm)
  • Diameter: 54.25 in (1,378 mm)
  • Dry weight: 1,184 lb (537 kg)
  • Valve-train: Two overhead valves per cylinder with a sodium-filled exhaust valve
  • Supercharger: Single-speed General Electric centrifugal type supercharger, blower ratio 7.134:1
  • Fuel system: Stromberg PD12K10 automatic mixture control downdraft carburettor
  • Fuel type: 87 octane rating gasoline
  • Oil system: Dry sump with one pressure and one scavenging pump
  • Cooling system: Air-cooled

Power output: 1,000 hp (746 kW) at 2,200 rpm for takeoff

  • Specific power: 0.46 hp/in (20.88 kW/L)
  • Compression ratio: 6.45:1
  • Specific fuel consumption: 0.6 lb/(hph) (362 g/(kWh))
  • Oil consumption: 0.35-0.39 oz/(hph) (13-15 g/(kWh))
  • Power-to-weight ratio: 0.84 hp/lb (1.39 kW/kg)

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