Pratt & Whitney Twin Wasp

R-1830 Twin Wasp
R-1830 on display at the Imperial War Museum Duxford
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	1932
Major applications	Consolidated B-24 Liberator Douglas C-47 Skytrain Grumman F4F Wildcat Consolidated PBY Catalina
Number built	173,618
Variants	Pratt & Whitney R-2000 Twin Wasp

The Pratt & Whitney R-1830 Twin Wasp was an American aircraft engine widely used in the 1930s and 1940s. Produced by Pratt & Whitney, it was a two-row, 14-cylinder, air-cooled radial design. It displaced 1,830 cu in (30.0 L) and its bore and stroke were both 5.5 in (140 mm). A total of 173,618 R-1830 engines was 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 (to a 5.75 inch/146 mm cylinder bore) with a slightly higher power rating and other slight changes in detail design was produced as the R-2000.

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