The Pacific War Online Encyclopedia
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National Museum of the U.S. Air Force
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).
750 hp (5400 feet)
559 kW (1650m)
||1200 hp (takeoff)
900 hp (14,000 feet)
|895 kW (takeoff)
671 hp (4300m)
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.
The Pacific War Online Encyclopedia © 2009 by Kent G. Budge. Index
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