The Napier Gazelle is a

turboshaft A turboshaft engine is a form of gas turbine that is optimized to produce shaftpower rather than jet thrust. In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the exhaust ...

helicopter engine that was manufactured by D. Napier & Son in the mid-1950s. In 1961 production was nominally transferred to a joint venture with

Rolls-Royce Rolls-Royce (always hyphenated) may refer to: * Rolls-Royce Limited, a British manufacturer of cars and later aero engines, founded in 1906, now defunct Automobiles * Rolls-Royce Motor Cars, the current car manufacturing company incorporated in ...

called Napier Aero Engines Limited."ENGLISH ELECTRIC-ROLLS ROYCE Napier Aero Engines Ltd." Times ondon, England1 June 1961: 24. The Times Digital Archive. Web. 30 Aug. 2016. But the venture closed two years later.Napier Aero Engines Ltd (closure)
Hansard, 8 March 1963 vol 673 cc921-32

Variants

;NGa.1:Emergency rating at 20,400 rpm, 1 hour rating at 19,800 rpm, Max continuous rating at 19,000 rpm ;NGa.2:Emergency rating at 20,400 rpm ;NGa.2(R): ;NGa.2 series 2: ;NGa.3:Emergency rating at 20,400 rpm ;NGa.4:Emergency rating at 20,400 rpm ;NGa.13(R): ;NGa.13 series 2: ;NGa.18: ;NGa.22: ;Mk.101: ;Mk.161: ;Mk.162: (NGa.13 series 2) ;Mk.165: ;Gazelle 501: ;Gazelle 503: ;Gazelle 512: ;Gazelle 514: ;Gazelle E.219:

Applications

These helicopter engines were used on the

Westland Wessex The Westland Wessex is a British-built turbine-powered development of the Sikorsky H-34 (in US service known as Choctaw). It was developed and produced under licence by Westland Aircraft (later Westland Helicopters). One of the main chang ...

HAS 1 and HAS 3 (other versions of the Wessex had two

Rolls-Royce Gnome The Rolls-Royce Gnome is a British turboshaft engine originally developed by the de Havilland Engine Company as a licence-built General Electric T58, an American mid-1950s design. The Gnome came to Rolls-Royce after their takeover of Bristol S ...

engines) and the Bristol Belvedere (later Westland Belvedere) transport

helicopter A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes ...

Engines on display

A preserved Napier Gazelle is on display at the

Royal Air Force Museum London The Royal Air Force Museum London (also commonly known as the RAF Museum) is located on the former Hendon Aerodrome. It includes five buildings and hangars showing the history of aviation and the Royal Air Force. It is part of the Royal Air Fo ...

. A preserved Napier Gazelle from a Westland Wessex helicopter is on display at the

Queensland Air Museum The Queensland Air Museum is a not-for-profit community-owned aviation museum located at Caloundra Airport in Queensland, Australia. Its mission is to collect and preserve all aspects of aviation heritage with an emphasis on Australia and Queens ...

, Caloundra, Australia. A Napier Gazelle is on display at the

South Yorkshire Aircraft Museum The South Yorkshire Aircraft Museum (SYAM) is a Volunteer led museum located at Lakeside in Doncaster, South Yorkshire, England. It occupies the former site of the Royal Air Force Station, RAF Doncaster. The museum occupies the last remaining o ...

Doncaster Doncaster (, ) is a city in South Yorkshire, England. Named after the River Don, it is the administrative centre of the larger City of Doncaster. It is the second largest settlement in South Yorkshire after Sheffield. Doncaster is situated in ...

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

References

Notes

Bibliography

* Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989. *

External links

''Flight'', July 1967, Napier Gazelle
{{Napierengines

Gazelle A gazelle is one of many antelope species in the genus ''Gazella'' . This article also deals with the seven species included in two further genera, '' Eudorcas'' and '' Nanger'', which were formerly considered subgenera of ''Gazella''. A third ...

1950s turboshaft engines