Rolls-Royce Spey

The Rolls-Royce Spey (company designations RB.163 and RB.168 and RB.183) is a low-bypass turbofan engine originally designed and manufactured by Rolls-Royce that has been in widespread service for over 40 years. Intended for the civilian jet airliner market when it was being designed in the late 1950s, the Spey concept was also used in various military engines, and later as a turboshaft engine for ships known as the Marine Spey, and even as the basis for a new civilian line, the Rolls-Royce Tay.

General characteristics (Spey Mk 202)

  • Type: Low bypass turbofan
  • Length: 204.9 in (5204.4 mm)
  • Diameter: 43.0 in (1092.2 mm)
  • Dry weight: 4,093 lb (1856 kg)


  • Maximum thrust: Dry thrust: 12,140 lbf (54 kN); with reheat: 20,500 lbf (91.2 kN)
  • Thrust-to-weight ratio: 5:1


  • Compressor: axial flow, 5-stage LP, 12-stage HP
  • Combustors: 10 can-annular combustion chambers
  • Turbine: 2-stage LP, 2-stage HP