Pratt & Whitney R-1830 Twin Wasp


The Pratt & Whitney R-1830 Twin Wasp is an American aircraft engine widely used in the 1930s and 1940s. Produced by Pratt & Whitney, it is a two-row, 14-cylinder, air-cooled radial design with seven cylinders on a row. It displaces and its bore and stroke are both 5.5 in. A total of 173,618 R-1830 engines were built, and from their use in two of the most-produced aircraft ever built, the four-engined B-24 heavy bomber and twin-engined DC-3 transport, more Twin Wasps may have been built than any other aviation piston engine in history. A "bored-out" version with a slightly higher power rating and other slight changes in detail design was produced as the R-2000. Mostly retired today, it is still used on Douglas DC-3 and various museum aircraft and warbirds seen at airshows. It is not manufactured anymore, but spares are still available and there exists a wide market for second-hand engines and parts.

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