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The Bristol Jupiter Aircraft Engine

The Bristol Jupiter was designed by Roy Fedden for the Bristol Aeroplane Company at the end of WW1 first run in October 1918. The Bristol Jupiter proved to be a great success and was the best, and most sold, radial aero-engine in the between war period. Although Bristol was the main producer of the engine it was also produced in great numbers under licence, Gnome-Rhone in France, Siemens-Halske in Germany, Nakajima in Japan, PZL in Poland, Alfa Romeo in Italy, Walter Engines in Czechoslovakia and Shvetsov in Russia.

Bristol Jupiter IXF Aircraft Engine


Production finally ceased in 1930 by which time at least 7,100 had been produced, the engine was then significantly re-designed and developed into the Bristol Mercury. The engine pictured above is a 550 hp Bristol Jupiter IXF. At the end of Jupiter production over 260 aircraft types had been powered by the Bristol Jupiter including licensed copies and over 80% of all aircraft at the 1929 Paris air-show were powered by the Jupiter.

Military aircraft that were powered by the Bristol Jupiter

Aero A.32Airco DH.9Arado Ar 64
Boulton Paul P.32Boulton Paul SidestrandBlackburn Ripon
Bristol BadgerBristol BoarhoundBristol Type 84 Bloodhound
Bristol BrandonBristol BulldogBristol Jupiter Fighter
Dornier Do 11Dornier Do JFairey III
Fairey FlycatcherFairey HendonFizir F1V
Fokker C.VFokker F.VIINakajima A1N
Gloster GamecockGloster GrebeGloster Survey
Gourdou-Leseurre GL.30Handley Page HinaidiHandley Page Type O
Handley Page H.P.42Hawker WoodcockParnall Plover
Polikarpov I-15PZL P.7Saunders Severn
Short RangoonSupermarine SeagullSupermarine Southampton
Svenska Aero JaktfalkenTupolev I-4Vickers Type 143
Vickers VespaVickers VictoriaVickers Wibault
Westland WapitiWestland WestburyWestland PV-3

Bristol Jupiter XFA Specifications:

  • Type: Nine-cylinder naturally aspirated air-cooled radial engine
  • Bore: 5.75 in (146 mm)
  • Stroke: 7.5 in (190 mm)
  • Displacement: 1,753 in³ (28.7 L)
  • Diameter: 54.5 in (1,384 mm)
  • Dry weight: 995 lb (451 kg)
  • Valve-train: Overhead poppet valve, four valves per cylinder, two intake and two exhaust
  • Supercharger: Single speed, single stage
  • Fuel type: 73-77 Octane petrol
  • Cooling system: Air-cooled

Bristol Jupiter XFA Power output:

  • 550 hp (414 kW) at 2,200 rpm at 11,000 ft (3,350 m) - maximum power limited to five minutes operation.
  • 525 hp (391 kW) at 2,000 rpm - maximum continuous power at 11,000 ft (3,350 m)
  • 483 hp (360 kW) at 2,000 rpm - takeoff power
  • Specific power: 0.31 hp/in³ (14.4 kW/L)
  • Compression ratio: 5.3:1
  • Power-to-weight ratio: 0.55 hp/lb (0.92 kW/kg)

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