Pratt & Whitney R-2000 Twin Wasp

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.

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 (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.

Applications

Specifications (R-2000-3)

R-2000 mounted on the wing of a Douglas DC-4

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

General characteristics

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)

Components

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

Performance

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

References

Notes

^ FAA Pratt & Whitney R-2000 TCDS TC5E-5 Retrieved: 26 December 2010

Bibliography

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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[1] FAA Pratt & Whitney R-2000 TCDS TC5E-5 Retrieved: 26 December 2010

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