Wright R-3350 Duplex-Cyclone
Developed before World War II, the R-3350's design required a long time to mature, and was still experiencing problems with reliability when used to power the Boeing B-29 Superfortress.A larger twin-row 22-cylinder version, the Wright R-4090 Cyclone 22, was experimented with as a competitor to the 4,360 in3 (71.4 L) displacement four-row, 28-cylinder Pratt & Whitney R-4360 Wasp Major, but was not produced.Things changed dramatically in 1940 with the introduction of a new contract by the USAAC to develop a long-range bomber capable of flying from the US to Germany with 20,000 lb (9,100 kg) of bombs.This proved unwise, as the early B-29s taking off at maximum weights, in the high temperature conditions of the B-29s tropical airfields, caused overheating that was not completely solved, and the engines also had a tendency to swallow valves.In these versions, three power-recovery turbines (PRT) were inserted into the exhaust of each group of six cylinders, and geared to the crankshaft by fluid couplings to deliver more power.Modifications on one, Rare Bear, include a nose case designed for a slow-turning prop, taken from an R-3350 used on the Lockheed L-1649 Starliner, mated to the power section (crankcase, crank, pistons, and cylinders) taken from an R-3350 used on the Douglas DC-7.
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