Napier Gazelle

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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 2 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
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)

References

Notes

↑ Gunston 1989, p.107.
↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 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

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

Wikimedia Commons has media related to Napier Gazelle.

Flight, July 1967, Napier Gazelle

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Turboprop / Turboshaft	Coupled Naiad Eland Gazelle Naiad

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Gas-generator	Oryx

Rocket	Scorpion

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