Wolseley Viper

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Rear view of preserved Wolseley Viper
Type Piston inline aero-engine
Manufacturer Wolseley Motors
First run 1918
Major applications Royal Aircraft Factory S.E.5

The Wolseley Viper is a British-built, high-compression derivative of the Hispano Suiza HS-8 liquid-cooled V-8 engine, built under licence by Wolseley Motors during World War I.

It powered later models of the S.E.5a, SPAD VII and other British or British-built aircraft designed for the Hispano-Suiza.


Wolseley W.4A Python I
Wolseley W.4A Python II
Wolseley W.4A Viper
Wolseley W.4B Adder I
Wolseley W.4B Adder II
Wolseley W.4B Adder III
Wolseley W.4A Python



A Wolseley Viper powered Royal Aircraft Factory S.E.5a is owned by, and on display at The Shuttleworth Collection, Old Warden Aerodrome in the UK.[1]

Engines on display[edit]

Specifications (W.4A Viper)[edit]

Data from Lumsden[2]

General characteristics

  • Type: 8-cylinder, upright, 90 degree Vee engine
  • Bore: 4.72 in (120 mm)
  • Stroke: 5.12 in (130 mm)
  • Displacement: 716.8 cu in (11.77 L)
  • Dry weight: 500 lb


  • Fuel system: Twin Zenith-Duplex carburettors
  • Cooling system: Liquid-cooled
  • Reduction gear: Direct drive, Right-hand tractor


See also[edit]

Related development

Comparable engines

Related lists



  1. ^ The Shuttleworth Collection - SE5a www.shuttleworth.org Retrieved: 09 March 2017.
  2. ^ Lumsden 2003, p. 232.


  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.