Napier Gazelle
| Gazelle | |
|---|---|
 | |
| Napier Gazelle at the Royal Air Force Museum London | |
| Type | Turboshaft aero engine |
| Manufacturer | Napier Aero Engines Ltd |
| First run | December 1955 |
| Major applications | Westland Wessex Bristol/Westland Belvedere |
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The Napier Gazelle was a turboshaft engine manufactured by Napier Aero Engines in the mid-1950s, production ceased when the Napier company was taken over by Rolls-Royce in 1962.[1]
Variants
- NGa.1
- NGa.2
- NGa.2(R)
- [2]
- NGa.2 series 2
- NGa.13(R)
- [2]
- NGa.13 series 2
- Mk.101
- [2]
- Mk.161
- [2]
- Mk.162
- (NGa.13 series 2)[2]
- Mk.165
- [2]
- Gazelle 501
- [2]
- Gazelle 503
- [2]
- Gazelle 512
- [2]
- Gazelle 514
- [2]
- Gazelle E.219
- [2]
Applications
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.
Specifications (Gazelle 501 / Mk.101 / NGa.2(R))
Left view, Fleet Air Arm Museum, Australia
Data from Jane's All the World's Aircraft 1962-63 and Flightglobal archive.[2][3]
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, (DERD 2482 / 2485 / 2486 / 2488 / 2494)
- Oil system: Pressure spray / splash with gear pump and dry sump, oil grade DERD.2487
Performance
- 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)/sec
- Specific fuel consumption: 0.688 lb/hp-hr (0.4185 kg/kW-hr)
- Power-to-weight ratio: 1.458 hp/lb (2.397 kW/kg)
See also
- Comparable engines
- Related lists
References
Notes
Bibliography
- 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
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