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Pratt & Whitney Wasp A, R-1300 (R-1340), Radial 9 Engine


Display Status:

This object is on display in the America by Air exhibition at the National Air and Space Museum in Washington, DC.

Collection Item Summary:

Having departed from Wright, Frederick Rentschler informed the Navy of his plan to manufacture air-cooled radial engines, and incorporated the Pratt & Whitney Aircraft Company on July 23, 1925. This Serial Number 1 Wasp, the first of a long series of famous aircraft engines from Pratt & Whitney, was completed on December 24, 1925 and finished the 50-hour approval test in March 1926. On May 5 a second Wasp took to the air in the Wright F3W-1 Apache aircraft. A contract for 200 Series A Wasps was received and production engines delivered before the end of 1926.

Known for its reliability, the new engine soon dominated U.S. fighter planes, and made commercial air transportation profitable in the Boeing 40A. The Boeing F2B-1 was the first operational aircraft to use the Wasp engine. Approximately 100 different experimental and production airplanes utilized the engine, with the Wasp R-1340 remaining in production until 1960.

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


George J. Mead


Credit Line

Transferred from the Department of the Navy, Bureau of Aeronautics




  • 3-D: 102.6 × 128.5cm, 326.6kg (40 3/8 × 50 5/8 in., 720lb.)
  • Support: 108.6 × 126.4 × 111.8cm (42 3/4 in. × 49 3/4 in. × 44 in.)

Country of Origin

United States of America



Physical Description

  • Type: Reciprocating, 9 cylinders, radial, air-cooled
  • Power rating: 317 kW (425 hp) at 1,900 rpm
  • Displacement: 22.2 L (1,344 cu in)
  • Bore and Stroke: 146 mm (5.8 in.) X 146 mm (5.8 in.)
  • Weight: 327 kg (720 lb)


PROPULSION-Reciprocating & Rotary

Inventory Number