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The Napier Gazelle is a turboshaft 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 called Napier Aero Engines Limited.[1] But the venture closed two years later.[2]
| Gazelle | |
|---|---|
 | |
| 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 |
- NGa.1
- 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[3]
- NGa.2
- Emergency rating 1,650 shp (1,230 kW) at 20,400 rpm[3]
- NGa.2(R)
- [4]
- NGa.2 series 2
- NGa.3
- Emergency rating 1,800 shp (1,300 kW) at 20,400 rpm[3]
- NGa.4
- Emergency rating 2,000 shp (1,500 kW) at 20,400 rpm[3]
- NGa.13(R)
- [4]
- NGa.13 series 2
- NGa.18
- NGa.22
- Mk.101
- [4]
- Mk.161
- [4]
- Mk.162
- (NGa.13 series 2)[4]
- Mk.165
- [4]
- Gazelle 501
- [4]
- Gazelle 503
- [4]
- Gazelle 512
- [4]
- Gazelle 514
- [4]
- Gazelle E.219
- [4]
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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.
 |
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. A Napier Gazelle is on display at the South Yorkshire Aircraft Museum, Doncaster A further Napier Gazelle is displayed at the Solent Sky Museum, Southampton
Data from Jane's All the World's Aircraft 1962-63 and Flightglobal archive.[4][5]
General characteristics
- Type: Turboshaft
- Length: 70 in (1,778 mm)
- Diameter: 33.5 in (851 mm)
- Dry weight: 830 lb (376.5 kg)
Components
- 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
- Oil system: Pressure spray / splash with gear pump and dry sump
Performance
- Maximum power output: 1,650 hp (1,230 kW) + 260 lbf (1.2 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/s (7.6 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)
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