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Pratt & Whitney Twin Wasp R-2000 (2SD13-G), 2-Row, Radial Engine


Display Status:

This object is on display in the Boeing Aviation Hangar room at Steven F. Udvar-Hazy Center in Chantilly, VA.

Pratt & Whitney Twin Wasp R-2000 (2SD13-G), 2-Row, Radial Engine

Collection Item Summary:

Derived as a modest development of the Twin Wasp R-1830, the R-2000 was designed specifically for the Douglas DC-4 commercial airliner, allowing use of lower octane fuel than generally used by the military. It was also used on the Air Force C-54 and Navy R5D (military versions of the DC-4); the Vought XF5U-1; Chase YC-122; and Cancargo CBY-3.

This engine, known as the X-100 (Pratt & Whitney's 100th experimental engine), was completed in 1940 as an R-2000 DG. During seven years of experimental development, it was changed into nearly every subtype of R-2000 engine to test many design improvements. In November 1945, it was converted to a post-World War II commercial 2SD13-G engine. After 4,493 hours of experimental operation, the X 100's last run was in October 1947. It was later restored to the 2SD13-G configuration for the Museum.

Collection Item Long Description:

Data Source

National Air and Space Museum


Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


Pratt & Whitney

Credit Line

Gift of Pratt & Whitney Aircraft


Diameter 124.7 cm (49.10 in), Length 151.5 cm (59.66 in.)

See more items in

National Air and Space Museum Collection

Country of Origin

United States of America



Physical Description

  • Type: Reciprocating, 14 cylinders, radial, 2 rows, air cooled
  • Power rating: 1,081 kW (1,450 hp) at 2,700 rpm
  • Displacement: 32.8 L (2,000 cu in.)
  • Bore and Stroke: 146 mm (5.75 in.) x 140 mm (5.5 in.)
  • Weight (dry): 720 kg (1,585 lb)


PROPULSION-Reciprocating & Rotary

Inventory Number