Pratt & Whitney R-1340 Wasp

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.[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

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.[2]

Variants

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

R-1340-7
450 hp (340 kW), 600 hp (450 kW)
R-1340-8
425 hp (317 kW)
R-1340-9
450 hp (340 kW), 525 hp (391 kW)
R-1340-16
550 hp (410 kW)
R-1340-17
525 hp (391 kW)
R-1340-19
600 hp (450 kW)
R-1340-19F
600 hp (450 kW)
R-1340-21G
550 hp (410 kW)
R-1340-22
550 hp (410 kW)
R-1340-23
575 hp (429 kW)
R-1340-30
550 hp (410 kW)
R-1340-31
550 hp (410 kW)
R-1340-33
600 hp (450 kW)
R-1340-48
600 hp (450 kW)
R-1340-49
600 hp (450 kW)
R-1340-AN1
550 hp (410 kW), 600 hp (450 kW)
R-1340-AN2
550 hp (410 kW), 3:2 geared prop shaft
R-1340-B
450 hp (340 kW)
R-1340-D
500 hp (370 kW)
R-1340-S1D1
525 hp (391 kW)
R-1340-S1H1-G
550 hp (410 kW), 600 hp (450 kW)
R-1340-S3H1
600 hp (450 kW)
R-1340-T1D1
520 hp (390 kW)

Applications
R-1340 powered Curtiss SOC Seagull

Engines on display

Overhaul

The engines can still be overhauled as well as serviced. The largest R-1340 overhaul facility in the world is the Radial Engine Division of Covington Aircraft in Okmulgee, Oklahoma.[8]

Specifications (R-1340-S1H1-G)
Pratt & Whitney R-1340 installed in a T-6 Texan

Data from Jane's.[9]

General characteristics

  • Type: Nine-cylinder single-row supercharged air-cooled radial engine
  • Bore: 5.75 in (146 mm)
  • Stroke: 5.75 in (146 mm)
  • Displacement: 1,344 in3 (22 L)
  • Length: 47.7 in (1,211 mm)
  • Diameter: 51.75 in (1.314 m)
  • Dry weight: 930 lb (422 kg)

Components

Performance


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See also

Related development

Related lists

References

Notes
  1. Pratt&Whitney R-1340 page Retrieved: 25 October 2008
  2. "Pratt’s first engine gets historic designation" from Hartford Business Journal, published February 1st Retrieved: 7 April 2016
  3. "Knoll KN-3". Western Flying. August 1929.
  4. http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1119 "Pratt & whitney R-1340 Wasp A"
  5. http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1113 "Pratt & Whitney R-1340 Wasp C Cutaway"
  6. http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1120 "Pratt & Whitney R-1340-0 Wasp C"
  7. http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1122 "Pratt & Whitney Roscoe Turner R-1340 Wasp Engine"
  8. "Radial Engines". Covington Aircraft. Retrieved October 26, 2019.
  9. Bridgman 1994, p. 81d.

Bibliography
  • Bridgman, Leonard. Jane's All the World's Aircraft 1945-46. Hammersmith, London: HarperCollinsPublishers (1994 reprint). ISBN 000 470831-8
  • Gunston, Bill. World Encyclopedia of Aero Engines: From the Pioneers to the Present Day. 5th edition, Stroud, UK: Sutton, 2006.ISBN 0-7509-4479-X
  • White, Graham. Allied Aircraft Piston Engines of World War II: History and Development of Frontline Aircraft Piston Engines Produced by Great Britain and the United States During World War II. Warrendale, Pennsylvania: SAE International, 1995. ISBN 1-56091-655-9
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