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Napier Gazelle


Napier-Gazelle

 

The Napier Gazelle was a turboshaft aero engine manufactured by Napier Aero Engines in the mid-1950s. First run in December 1955, production ceased when the Napier company was taken over by Rolls-Royce in 1962.

 

Variants:
NGa.1
NGa.2
NGa.2(R)
NGa.2 series 2
NGa.13(R)
NGa.13 series 2
Mk.101
Mk.161
Mk.162 (NGa.13 series 2)
Mk.165
Gazelle 501
Gazelle 503
Gazelle 512
Gazelle 514
Gazelle E.219

 

Applications:
Westland Wessex HAS 1 and HAS 3
Bristol Belvedere

 

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
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)

 

 

 

 

 

 


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