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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

Variants

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]

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. 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))

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)

See also

Comparable engines

• General Electric T58
• Rolls-Royce Gnome

Related lists

• List of aircraft engines

References

Notes

Bibliography

External links

• Flight, July 1967, Napier Gazelle

На других языках

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- [en] Napier Gazelle

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[es] Napier Gazelle

El Napier Gazelle es un motor de turboeje fabricado por Napier & Son, que fue comprado por Rolls-Royce en 1962.[1] Estos motores de helicóptero fueron utilizados en el Westland Wessex HAS3 y en el Bristol Belvedere (después Westland Belvedere).

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[fr] Napier Gazelle

Le Napier Gazelle était un turbomoteur[3] britannique, conçu et produit par la société D. Napier & Son Limited à milieu des années 1950. En 1961, la production ft transférée nominativement à une entreprise conjointe avec Rolls-Royce Limited, appelée Napier Aero Engines Limited[4], mais cette association prit fin deux ans plus tard[5].

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[it] Napier Gazelle

Il Napier Gazelle, poi Rolls-Royce Gazelle, era un motore aeronautico turboalbero prodotto del 1956 dall'azienda britannica Napier Aero Engines e dal 1961, dopo l'assorbimento di questa, dalla Rolls-Royce Limited.

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