The Pratt & Whitney R-1340 Wasp is an

aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Aircraft using power components are referred to as powered flight. Most aircraft engines are either piston engines or gas turbin ...

of the reciprocating type that was widely used in American

aircraft An aircraft ( aircraft) is a vehicle that is able to flight, fly by gaining support from the Atmosphere of Earth, air. It counters the force of gravity by using either Buoyancy, static lift or the Lift (force), dynamic lift of an airfoil, or, i ...

from the 1920s onward. It was the

Pratt & Whitney Pratt & Whitney is an American aerospace manufacturer with global service operations. It is a subsidiary of RTX Corporation (formerly Raytheon Technologies). Pratt & Whitney's aircraft engines are widely used in both civil aviation (especially ...

aircraft company's first engine, and the first of the famed Wasp series. It was a single-row, nine-

cylinder A cylinder () has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infinite ...

air-cooled Air-cooled engines rely on the circulation of air directly over heat dissipation fins or hot areas of the engine to cool them in order to keep the engine within operating temperatures. Air-cooled designs are far simpler than their liquid-cooled ...

radial Radial is a geometric term of location which may refer to: Mathematics and Direction * Vector (geometric), a line * Radius, adjective form of * Radial distance (geometry), a directional coordinate in a polar coordinate system * Radial set * A ...

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 A fixed-wing aircraft is a heavier-than-air aircraft, such as an airplane, which is capable of flight using aerodynamic lift. Fixed-wing aircraft are distinct from rotary-wing aircraft (in which a rotor mounted on a spinning shaft generate ...

, it was used to power helicopters, the Agusta-Bell AB.102 and the

Sikorsky H-19 The Sikorsky H-19 Chickasaw (company model number S-55) is a multi-purpose piston-engined helicopter that was used by the United States Army and United States Air Force. It was also license-built by Westland Aircraft as the Westland Whirlwin ...

, 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 The American Society of Mechanical Engineers (ASME) is an American professional association that, in its own words, "promotes the art, science, and practice of multidisciplinary engineering and allied sciences around the globe" via "continuing edu ...

Variants

''Note:'' R for Radial and 1340 for 1340

cubic inch displacement The cubic inch (symbol in3) is a unit of volume in the Imperial units and United States customary units systems. It is the volume of a cube with each of its three dimensions (length, width, and height) being one inch long which is equivalent t ...

. ;R-1340-7: , ;R-1340-8: ;R-1340-9: , ;R-1340-16: ;R-1340-17: ;R-1340-19: ;R-1340-19F: ;R-1340-21G: ;R-1340-22: ;R-1340-23: ;R-1340-30: ;R-1340-31: ;R-1340-33: ;R-1340-48: ;R-1340-49: ;R-1340-AN1: , ;R-1340-AN2: , 3:2 geared prop shaft ;R-1340-B: ;R-1340-D: ;R-1340-S1D1: ;R-1340-S1H1-G:, ;R-1340-S3H1: ;R-1340-T1D1:

Applications

Engines on display

* There are a Wasp A and three Wasp C's on display at the

New England Air Museum The New England Air Museum (NEAM) is an American aerospace museum located adjacent to Bradley International Airport in Windsor Locks, Connecticut. The museum consists of three display hangars with additional storage and restoration hangars. Its ...

Bradley International Airport Bradley International Airport – historically known as Bradley Field – is a public international airport in Windsor Locks, Connecticut, Windsor Locks, Connecticut, United States. Owned and operated by the Connecticut Airport Authority, Con ...

, Windsor Locks, CT.http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1122 "Pratt & Whitney Roscoe Turner R-1340 Wasp Engine"

Specifications (R-1340-S1H1-G)

References

Notes

Bibliography

* Bridgman, Leonard. ''Jane's All the World's Aircraft 1945-46.'' Hammersmith, London: HarperCollinsPublishers (1994 reprint). *Gunston, Bill. ''World Encyclopedia of Aero Engines: From the Pioneers to the Present Day''. 5th edition, Stroud, UK: Sutton, 2006. *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.

External links

"Index of Wasp & R-1340 Designated Engines"
a scanned Pratt & Whitney reference document from 1956 detailing the different Wasp versions, their specifications, and the aircraft they were installed in. * *There is
"Pratt & Whitney 1340N Radial Engine"
in use on a T-6 Texan at Pacific Warbirds, Oahu, HI {{DEFAULTSORT:Pratt and Whitney R-1340 Wasp Aircraft air-cooled radial piston engines R-1340 1920s aircraft piston engines