|Type:||18-cylinder, two-row, air-cooled, radial, piston|
|Displacement:||3,350 cu. in.|
|Power Output:||2,200 hp @ 2,800 rpm|
The R-3350 was one of the largest and most powerful piston radial aircraft engines produced. Design of the engine began in 1936 and was first run on 1937 but was plagued with catastrophic backfires. After a long evelopment and testing process, it was ready to be used to power the new Boeing B-29 which first flew on September 21, 1942. The engines remained temperamental and had a tendency to overheat. This engine differs from the R-3350-23 in that is used direct fuel injection with each row of cylinders having its own fuel-injection pump. The R-3350-57 was the model that powered Col. Paul Tibbet's Enola Gay.
A total of nearly 7,000 R-3350-57 engines were produced from January 1944 to November 1945.
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