Pratt & Whitney R-1340-AN-1

R-1340 Wasp
The first Pratt & Whitney Wasp
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	29 December 1925
Major applications	Boeing 247 de Havilland Canada DHC-3 Otter North American T-6 Texan Sikorsky H-19 Sikorsky S-38
Number built	34,966
Developed into	Pratt & Whitney R-985 Wasp Junior

The Pratt & Whitney R-1340 Wasp was an aircraft engine of the reciprocating type that was widely used in American aircraft from the 1920s onward. It was the Pratt & Whitney aircraft company's first engine, and the first of the famed Wasp series. It was a single-row, nine-cylinder, air-cooled, radial design, and displaced 1,344 cubic inches (22 L); bore and stroke were both 5.75 in (146 mm). A total of 34,966 engines were produced.

As well as numerous types of fixed-wing aircraft, it was used to power helicopters, the Agusta-Bell AB.102 and the Sikorsky H-19, and a class of airship, the K-class blimp.

In 2016, it received designation as a Historic Engineering Landmark from the American Society of Mechanical Engineers.

Note: R for Radial and 1340 for 1340 cubic inch displacement.

Data from Jane's.

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