Pratt & Whitney R-1340 Wasp

R-1340 Wasp
The first Pratt & Whitney Wasp
TypeRadial engine
National originUnited States
ManufacturerPratt & Whitney
First run29 December 1925
Major applications
Manufactured1926–1960
Number built34,966
Developed intoPratt & Whitney R-985 Wasp Junior

The Pratt & Whitney R-1340 Wasp is 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.

Variants

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

Applications

R-1340 powered Curtiss SOC Seagull, 1939
The gondola of a US Navy K-class blimp. One of its two R-1340 engines is being serviced, 1943

Engines on display

Specifications (R-1340-S1H1-G)

Pratt & Whitney R-1340 installed in a T-6 Texan

Data from Jane's.

General characteristics

Components

Performance

See also

Related development

Related lists

References

Notes

  1. ↑ "Pratt & Whitney Piston Engine Production". Aircraft Engine Historical Society. Retrieved 22 September 2026.
  2. ↑ "R-1340 Wasp". Pratt & Whitney. Archived from the original on 7 October 2007. Retrieved 4 September 2026.
  3. ↑ "Pratt's First Engine Gets Historic Designation". HartfordBusiness.com. 1 February 2016. Archived from the original on 2 February 2016. Retrieved 4 September 2026.
  4. ↑ "Knoll KN-3". Western Flying. August 1929.
  5. ↑ "Pratt & Whitney R-1340 Wasp A". New England Air Museum. Archived from the original on 24 June 2015. Retrieved 4 September 2026.
  6. ↑ "Pratt & Whitney R-1340 Wasp C Cutaway". New England Air Museum. Archived from the original on 24 June 2015. Retrieved 4 September 2026.
  7. ↑ "Pratt & Whitney R-1340-0 Wasp C". New England Air Museum. Archived from the original on 24 June 2015. Retrieved 4 September 2026.
  8. ↑ "Pratt & Whitney Roscoe Turner R-1340 Wasp Engine". New England Air Museum. Archived from the original on 24 June 2015. Retrieved 4 September 2026.
  9. ↑ Bridgman 1994, p. 81d.

Bibliography