Napier Gazelle

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Napier Gazelle at the Royal Air Force Museum London
Type Turboshaft aero engine
Manufacturer D. Napier & Son
First run December 1955
Major applications Westland Wessex
Bristol/Westland Belvedere

The Napier Gazelle was a turboshaft engine manufactured by D. Napier & Son in the mid-1950s. In 1961 production was nominally transferred to a joint venture with Rolls-Royce called Napier Aero Engines Limited.[1] But the venture closed two years later.[2]


NGa.2 series 2
NGa.13 series 2
(NGa.13 series 2)[3]
Gazelle 501
Gazelle 503
Gazelle 512
Gazelle 514
Gazelle E.219


These helicopter engines were used on the Westland Wessex HAS 1 and HAS 3 (other versions of the Wessex had two Rolls-Royce Gnome engines) and the Bristol Belvedere (later Westland Belvedere) transport helicopter.

Engines on display[edit]

A preserved Napier Gazelle is on display at the Royal Air Force Museum London. A preserved Napier Gazelle from a Westland Wessex helicopter is on display at the Queensland Air Museum, Caloundra, Australia.

Specifications (Gazelle 501 / Mk.101 / NGa.2(R))[edit]

Data from Jane's All the World's Aircraft 1962-63 and Flightglobal archive.[3][4]

General characteristics

  • Type: Turboshaft
  • Length: 70 in (1,778 mm)
  • Diameter: 33.5 in (851 mm)
  • Dry weight: 830 lb (376.5 kg)


  • Compressor: 11-stage axial flow
  • Combustors: 6 flame tubes
  • Turbine: 2-stage gas generator power turbine + 1-stage free power turbine
  • Fuel type: Aviation kerosene, (DERD 2482 / 2485 / 2486 / 2488 / 2494)
  • Oil system: Pressure spray / splash with gear pump and dry sump, oil grade DERD.2487


See also[edit]

Comparable engines
Related lists



  1. ^ "ENGLISH ELECTRIC-ROLLS ROYCE Napier Aero Engines Ltd." Times [London, England] 1 June 1961: 24. The Times Digital Archive. Web. 30 Aug. 2016.
  2. ^ Napier Aero Engines Ltd (closure) Hansard, 8 March 1963 vol 673 cc921-32
  3. ^ a b c d e f g h i j k l Taylor, John W.R. FRHistS. ARAeS (1962). Jane's All the World's Aircraft 1962-63. London: Sampson, Low, Marston & Co Ltd. 
  4. ^ Flightglobal online archive


  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
  • Taylor, John W.R. FRHistS. ARAeS (1962). Jane's All the World's Aircraft 1962-63. London: Sampson, Low, Marston & Co Ltd. 

External links[edit]