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Pratt & Whitney R-1340 Wasp Radial Engine

Location: Windsor Locks, CT, USA
Date: 1925
Creator(s): Rentschler, Fredrick

Aircraft engines, considered unreliable during the first 20 years of aviation due to their need for liquid-cooling, heavy weight and other inconsistencies, were given a revolutionary boost with the development of Pratt & Whitney’s R-1340 Wasp Radial Engine in 1925.

Engineers led by Chief Executive Officer Fredrick Rentschler, Vice President of Engineering George Mead, and Chief Engineer Andy Willgoos implemented a number of improvements: a single piece master rod allowed the engine to operate at a higher number of revolutions per minute, producing more horsepower; a two-piece crankshaft able to maintain required tolerances – making the single piece master rod possible; and a split crankcase with two identical halves. This improve the engine’s manufacturability, reducing assembly time and complexity.

These innovations set a new standard for aircraft engine reliability, impacting commercial aviation and transcontinental mail service, and leading to more advanced aircraft in the late 1920s and early 1930s – such as the Boeing 247. Over 90 versions of the R-1340 engine are in operation today.

Era: 1920-1929
Innovation designated by:
Pratt & Whitney Wasp A, R-1300 (R-1340)
Courtesy Flickr/nostri-imago (CC BY 2.0)
Pratt & Whitney Wasp A, R-1300 (R-1340)
New England Air Museum
36 Perimeter Road
Windsor Locks, CT, USA

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