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R-1820 Aircraft Engine


Photograph of R-1820 aircraft engine
National Museum of the U.S. Air Force

The Wright R-1820 Cyclone was an air-cooled radial aircraft engine with nine cylinders. First developed in 1931, but drawing on previous Cyclone series engines, it used Heron-type cylinders with enclosed splayed valves and had an integral supercharger and forged crankcase. It was one of the first aircraft engines with provisions for a Hamilton variable-pitch propeller. The bore diameter was f 6.125 inches (156mm) and the stroke was 6.875 inches (175mm).

Model
Horsepower
Wattage
22
950 hp
708 kW
33
775 hp (takeoff)
750 hp (5400 feet)
578 kW (takeoff)
559 kW (1650m)
40
1200 hp (takeoff)
900 hp (14,000 feet)
895 kW (takeoff)
671 hp (4300m)
49
975 kW
727 kW
50
950 hp
708 kW
53
1000 hp
746 kW
56
1350 hp
1000 kW
65
1200 hp
895 kW
G102A
1100 hp
820 kW
G205A
1200 hp
895 kW

Aircraft using the R-1820 included the F2A Buffalo, F3F, F4F Wildcat, J2F Duck, SBD Dauntless, A-28 Hudson, B-10 Martin, B-17 Flying Fortress, B-18 Bolo, Do-24, C.XI-W and O-47.

References

Gunston (2006)
National Museum of the U.S. Air Force (accessed 2009-4-11)


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