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Bristol Jupiter VIIIF Radial Engine


Display Status:

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

Bristol Jupiter VIIIF Radial Engine

Collection Item Summary:

Bristol Jupiter VIIIF

The Jupiter was Great Britain’s most successful high-power, air-cooled engine in the 1920s and ’30s. Bristol Aeroplane acquired the assets of Cosmos Engineering in 1920, which included the Jupiter and its designer, Roy Fedden. The Royal Air Force adopted the Jupiter as its first post–World War I engine in 1923. Bristol and its licensees built more than 7,000 Jupiters for at least 262 different aircraft types.

The Model VIII was the first Jupiter to use reduction gearing, which allowed the engine and propeller to rotate at different speeds for increased efficiency. The Model VIIIF powered the Blackburn B.T. 1 Beagle, Boulton-Paul P.29 Sidestrand III, Handley Page H.P.33 Clive I, Vickers 192 Vildebeest, and Westland Wapiti I, IA, II, and IIA. The “F” denoted a lightweight forged aluminum cylinder head, an important advance in reciprocating engines.

Transferred from the U.S. Navy

Type:reciprocating, 9 cylinders, single-row radial, air cooled

Power rating:343 kW (460 hp) at 2,000 rpm

Displacement:28.7 L (1,753 cu in)

Weight (dry):408 kg (900 lb)

Manufacturer:Bristol Aeroplane Co., Bristol, England


Collection Item Long Description:

Data Source

National Air and Space Museum


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


Roy Fedden

Credit Line

Transferred from the U.S. Navy


Diameter 134.6 cm (53.0 in.), Length 114.3 (45.0 in.)

Country of Origin

United Kingdom



Physical Description

  • Type: Reciprocating, 9 cylinders, radial, air cooled
  • Power rating: 343 kW (460 hp) at 2,000 rpm
  • Displacement: 28.7 L (1,753 cu in.)
  • Bore and Stroke: 147.5 mm (5.75 in.) x 190.5 mm (7.5 in.)
  • Weight (dry): 408 kg (900 lb)


PROPULSION-Reciprocating & Rotary

Inventory Number