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R-2000 Twin Wasp
A preserved R-2000 Twin Wasp
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	1942
Major applications	C-54 Skymaster Douglas DC-4 de Havilland Canada DHC-4 Caribou
Developed from	Pratt & Whitney R-1830 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.

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 (146 mm), while it still retained the 5.5 in (140 mm) stroke. This brought displacement up to 2,000 in³ (32.8 L). 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.

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

Data from FAA Type Data Certificate (TCDS)^[1]

• Type: Twin-row radial engine, 14 cylinder
• Bore: 5.75 in (146.05 mm)
• Stroke: 5.5 in (139.7 mm)
• Displacement: 2,004 in³ (32.84 L)
• Length: 61.02 in (1,550 mm)
• Diameter: 49.49 in (1,257 mm)
• Dry weight: 1,570 lb (710 kg)

• Fuel system: Stromberg carburetor
• Fuel type: 100/130 grade gasoline
• Cooling system: Air-cooled
• Reduction gear: 2:1

• Power output: 1,350 hp (1,010 kW) at 2,700 rpm (sea level)
• Compression ratio: 6.5:1

Related development

• Pratt & Whitney R-1340 Wasp
• Pratt & Whitney R-985 Wasp Junior
• Pratt & Whitney R-1535 Twin Wasp Junior
• Pratt & Whitney R-1830 Twin Wasp
• Pratt & Whitney R-2800 Double Wasp
• Pratt & Whitney R-4360 Wasp Major

Related lists

• List of aircraft engines

Wikimedia Commons has media related to Pratt & Whitney R-2000.

• Gunston, Bill. World Encyclopedia of Aero Engines: From the Pioneers to the Present Day. 5th edition, Stroud, UK: Sutton, 2006.ISBN 0-7509-4479-X
• White, Graham. Allied Aircraft Piston Engines of World War II: History and Development of Frontline Aircraft Piston Engines Produced by Great Britain and the United States During World War II. Warrendale, Pennsylvania: SAE International, 1995. ISBN 1-56091-655-9

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