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

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Display Status:

This object is on display in the Boeing Aviation Hangar room at Steven F. Udvar-Hazy Center in Chantilly, VA.

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

Collection Item Summary:

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.

Collection Item Long Description:

Data Source

National Air and Space Museum

Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum

Manufacturer

Credit Line

Transferred from the Naval Aviation Museum

Materials

Overall - aluminum and steel.

Dimensions

Height: 117.5 cm (46.25 in.), Width: 117.5 cm (46.25 in.), Depth: 109.4 cm (43.06 in.)

Country of Origin

United States of America

Date

1942

Physical Description

  • 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)

Type

PROPULSION-Reciprocating & Rotary

Inventory Number

A19761858000