|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|
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. But the venture closed two years later.
- Emergency rating 1,260 shp (940 kW) at 20,400 rpm, 1 hour rating 1,100 shp (820 kW) at 19,800 rpm, Max continuous rating 920 shp (690 kW) at 19,000 rpm
- Emergency rating 1,650 shp (1,230 kW) at 20,400 rpm
- NGa.2 series 2
- Emergency rating 1,800 shp (1,300 kW) at 20,400 rpm
- Emergency rating 2,000 shp (1,500 kW) at 20,400 rpm
- NGa.13 series 2
- (NGa.13 series 2)
- 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
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))
- 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
- Maximum power output: 1,650 hp (1,230.4 kW) + 260 lbf (1.16 kN) thrust at 3,000 output shaft rpm, maximum rating for 2.5 minutes
- Overall pressure ratio: 6.25:1
- Air mass flow: 16.8 lb (8 kg)/s
- Specific fuel consumption: 0.688 lb/(hp h) (0.4185 kg/(kW h))
- Power-to-weight ratio: 1.458 hp/lb (2.397 kW/kg)
- "ENGLISH ELECTRIC-ROLLS ROYCE Napier Aero Engines Ltd." Times [London, England] 1 June 1961: 24. The Times Digital Archive. Web. 30 Aug. 2016.
- Napier Aero Engines Ltd (closure) Hansard, 8 March 1963 vol 673 cc921-32
- Wilkinson, Paul H. (1957). Aircraft engines of the World 1957 (15th ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 154–155.
- Taylor, John W.R. FRHistS. ARAeS (1962). Jane's All the World's Aircraft 1962-63. London: Sampson, Low, Marston & Co Ltd.
- Flightglobal online archive
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