Pratt & Whitney Wasp Jr. R-985-AN-14B "Dancing Engine"

Begun in 1925 by former Wright Aeronautical employees as a spinoff from a machine tool company, Pratt & Whitney became one of the world’s largest manufacturers of aircraft engines, and the Wasp Jr. is one of the most successful reciprocating engines ever built. Pratt & Whitney introduced it as a complement to the highly successful Wasp and Hornet families of engines in 1930. The Wasp Jr. was essentially a Wasp of reduced dimensions. Pratt & Whitney and its licensees manufactured over 39,000 versions of the R-985 until 1953 for a wide variety of military and commercial aircraft, including light transports, trainers, sport aircraft, and helicopters.

The R-985-AN-14B powered the McDonnell XHJH-1 and XHJD-1 Whirlaway helicopters and the Avro Anson V trainer. This Wasp Jr.-aptly nicknamed "The Dancing Engine"- has been sectionalized and motorized to demonstrate the movements of its internal components.

• Type: Reciprocating, Radial, 9 cylinders, air cooled
• Power rating: 336 kW (450 hp) at 2,300 rpm
• Displacement: 16.1 L (985 cu in)
• Bore and Stroke: 132 mm (5.2in.) x 132 mm (5.2 in.)
• Weight: 309 kg (682 lb)

Where this page came from

This page was imported from Smithsonian National Air and Space Museum. Released by the Smithsonian Institution under CC0 through Smithsonian Open Access.

Nobody has written it yet — it is the source material at a new address, which is why search engines are asked to skip it and why no one earns from it. It is up for grabs: take it on, and it is yours to rewrite and to earn from.