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Pratt & Whitney R-2800 - Castle Museum

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R-2800 Double Wasp air-cooled engine

C-56 Loadstar Castle Air Museum

First introduced in 1939 the Pratt & Whitney R-2800 Double Wasp 18-cylinder air-cooled radial engine was used widely in many American and British aircraft during and after World War II. It was the most powerful air-cooled aircraft engine when introduced.

It could produce 1,850 - 2,000 horsepower, depending on the version and the company was always working to improve that number. Air-cooled engines were preferred over liquid-cooled for combat applications because a single bullet penetrating the cooling system could disable a liquid-cooled engine very quickly. This engine is on display at Castle Air Museum in Atwater, California.

The R-2800 Double Wasp engine was was used in the following American World War II aircraft:
Republic P-47 Thunderbolt Douglas A-26 Invader Prat and Whitney engine
Martin B-26 Marauder Northrop P-61 Black Widow
Grumman F7F Tigercat Curtiss C-46 Commando
Grumman F8F Bearcat Lockheed Ventura
Grumman F6F Hellcat Vought F4U Corsair