Wright R-3350 Cyclone 18
R-3350 was one of the most powerful radial engines produced in the United
States. Using 18 cylinders of the R-2600, gave it a displacement of 3,342
cubic inches. The crucial application was for the Boeing B-29.
The R-3350 was first run in 1937. The earliest flight I can find is on the
XB-19 in 1941. The Cyclone 18 became the engine of choice for large
military and civilian aircraft into the 1950s.
Some later versions of the R-3350 were produced as "turbo compound"
engines. Three exhaust driven turbines converted about 20% of the exhaust
gas heat energy into useful power. These turbines drove a gearing
mechanism that added power to the engine crankshaft.
- R-3350-23: 2,200 hp (1641 kW) with turbocharger
R-3350-26B: 2,800 hp (2088 kW)
- R-3350-32W: 3,500 hp (2610 kW) turbo-compound
- R-3350-34: 2,200 hp (1641 kW)
- R-3350-85: 3,500 hp (2610 kW)
- R-3350-91: 3,250 hp (2424 kW)
- 18 cylinder, air-cooled, two-row radial
- displacement: 3,342 cubic inches (54.8 litres)
- bore x stroke: 6.125 x 6.3125 inches
- Douglas AD-1 Skyraider
- Boeing B-29 Superfortress
- Lockheed L-49/C-69 Constellation
- Fairchild C-119 Flying Boxcar
- Lockheed L-749/C-121 Constellation
- Lockheed P2V Neptune