Pratt & Whitney R-2000 Twin Wasp

The Pratt & Whitney R-2000 Twin Wasp is an American radial engine developed in 1942 to power military aircraft. It is one of the Pratt & Whitney Wasp series of Radial engines.

Design and development
The R-2000 was an enlarged version of the Pratt & Whitney R-1830 Twin Wasp, with focus on reducing the manufacturing costs and fuel requirements. The bore was increased to 5.75 in, while it still retained the 5.5 in stroke. This brought displacement up to 2000 in3. There were a number of detail changes from the R-1830, such as front-mounted instead of rear-mounted magnetos (as with the larger, and earlier Double Wasp), plain bearings for the crankshaft rather than roller bearings, and 87 octane fuel (specified because there were fears wartime supplies of 100 octane might fall short, but those fears were groundless). The R-2000 produced 1,300 hp @ 2,700 rpm with 87 octane, 1,350 hp with 100 octane and 1,450 hp @ 2,800 rpm with 100/130-grade fuel.

Applications

 * Aviation Traders Carvair
 * Douglas C-54 Skymaster
 * Douglas DC-4
 * Douglas Hyper DC-3
 * de Havilland Canada DHC-4 Caribou
 * Vought XF5U