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.
The new engine soon became known for its reliability, dominating U.S. fighter planes, and making 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 were built with Wasps. The Wasp R-1340 remained in production until 1960.
Transferred from the Department of the Navy, Bureau of Aeronautics
Country of Origin: United States of America
Diameter 128 5 cm (50.6 in.), Length 102.6 cm (40.4 in.)
Type: Reciprocating, 9 cylinders, radial, air-cooled
Power rating: 317 kW (425 hp) at 1,900 rpm
Dispacement: 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)