Wright R-3350 Duplex-Cyclone
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The Wright R-3350 Duplex-Cyclone is an American twin-row, supercharged, air-cooled, radial aircraft engine with 18 cylinders displacing nearly 3,350 cubic inches (54.9 L). Power ranged from 2,200 to over 3,700 hp, depending on the model. Developed before World War II, the R-3350's design required a long time to mature before finally being used to power the Boeing B-29 Superfortress.
Wright R-3350 Duplex-Cyclone
Wright R-3350 Turbo-Compound radial engine. Two exhaust recovery turbines shown outside impeller casing area (top (silver) and lower (red blading)) that are geared to the crankshaft.
Wright R-3350 Turbo-Compound radial engine fitted at the number four position on the starboard wing of a Lockheed Super Constellation
R-3350 on display at the Air Zoo
Radial engine
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The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a "star engine" in some other languages.
Radial engine in a biplane
Master rod (upright) and slaved connecting rods from a two-row, fourteen-cylinder Pratt & Whitney R-1535 Twin Wasp Junior
Continental radial, 1944
Pratt & Whitney R-1340 radial mounted in Sikorsky H-19 helicopter