Bristol Phoenix

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Type Diesel aircraft engine
Manufacturer Bristol Aeroplane Company
First run 1928
Major applications Westland Wapiti

The Phoenix was an experimental version of the Bristol Aeroplane Company's Pegasus engine, adapted to run on the Diesel cycle. Only a few were built between 1928 and 1932, although samples fitted to a Westland Wapiti held the altitude record for diesel-powered aircraft at 27,453 ft (8,368 m) from 11 May 1934 until World War II.[1] The primary advantage of the Phoenix was better fuel efficiency at cruise, by up to 35%.


  • Phoenix I: - Diesel version of the Pegasus IF, 380 hp.
  • Phoenix IIM: - Medium-supercharged diesel version of Pegasus IM, 470 hp.


Specifications (Phoenix I)[edit]

Data from Lumsden[2]

General characteristics

  • Type: nine-cylinder air-cooled Diesel radial engine
  • Bore: 5.75 in (146 mm)
  • Stroke: 7.5 in (190 mm)
  • Displacement: 1,753 in³ (28.7 l)
  • Length: 43.75 in (1,111 mm)
  • Diameter: 55.25 in (1,403 mm)
  • Dry weight: 1,067 lb (484 kg)



See also[edit]

Comparable engines
Related lists



  1. ^ Gunston 1989, p.32.
  2. ^ Lumsden 2003, p.114.


  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links[edit]