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The Napier Eland was a British turboshaft or turboprop gas-turbine engine built by Napier & Son in the early 1950s. Production of the Eland ceased in 1961 when the Napier company was taken over by Rolls-Royce.[1]

Eland
Napier Eland on display at the Helicopter Museum (Weston).
Type	Turboshaft/turboprop aero-engine
Manufacturer	Napier & Son
First run	1953
Major applications	Fairey Rotodyne Convair CV-540

Design and development

The Eland was first tested in 1953 in a Vickers Varsity aircraft.[2] Further flight proving was carried out from 1955 using the first production Airspeed Ambassador 2.[3] The Eland was dropped from production when Napiers was acquired by Rolls-Royce Limited in 1961.[2]

The Eland was used to power various aircraft including the Westland Westminster heavy-lift helicopter, the Canadair CL-66; a turbine-powered version of the Convair CV-340 for the Canadian military[2](later converted to Allison T-56 propjets after a number of engine failures), and the Fairey Rotodyne gyrodyne. In the Rotodyne, the Eland powered the tractor propellers for forward flight and a compressor, via a clutch and shaft arrangement, to feed the rotor tip-jets with compressed air for vertical flight.[4]

Variants

Eland N.El.1

2,690 hp (2,010 kW) + 825 lbf (3.67 kN) residual thrust, static at sea level ICAN conditions.[5]

Eland N.El.3

Powerplant for the Fairey Rotodyne driving the propeller and an auxiliary compressor to feed the rotor tip jets 2,805 hp (2,092 kW) + 500 lbf (2.22 kN) residual thrust, static at sea level ICAN conditions.[5]

Eland N.El.4

3,765 hp (2,808 kW) + 610 lbf (2.71 kN) residual thrust, static at sea level ICAN conditions.[5]

Eland N.El.6

[6]

Eland N.El.7

The 504 adapted to helicopter / convertiplane, compressed air generator use.[6]

Eland E.211

The 504 adapted for mechanically driven helicopter rotors.[6]

Eland 504

(N.El.6)[6]

Eland 508

504 with increased max continuous rating.[6]

Applications

Turboshaft

• Westland Westminster

Turboprop

• Airspeed Ambassador
• Canadair CC-109 Cosmopolitan (CL-66)
• Convair CV-540
• Fairey Rotodyne
• Vickers Varsity (one aircraft as an engine test bed in 1954)

Engines on display

A turboshaft Eland is on display at the Helicopter Museum, Weston-super-Mare.[7]

Specifications (Eland N.El.6)

Data from Flight 29 August 1958 p.340[8]

General characteristics

• Type: Single-shaft turboprop
• Length: 120 in (3,000 mm)
• Diameter: 36 in (910 mm)
• Dry weight: 1,735 lb (787 kg)

Components

• Compressor: 10-stage axial flow
• Combustors: 6 chambers
• Turbine: 3-stage
• Fuel type: Jet fuel

Performance

• Maximum power output: 3,500 hp (2,600 kW) (eshp - equivalent shaft horse-power - adding power from residual thrust)
  
• Overall pressure ratio: 7:1
• Air mass flow: 31 lb/s (14 kg/s)
• Specific fuel consumption: 0.595 lb/h (eshp)
• Thrust-to-weight ratio: 2.0 eshp/lb (3.3 kW/kg)

See also

Comparable engines

• Allison T56
• Bristol Proteus
• Ivchenko AI-20
• Lycoming T55
• Rolls-Royce Tyne

Related lists

• List of aircraft engines

References

Notes

Bibliography

External links

• Atlantic Canada Aviation Museum - Napier Eland 504 information sheet
• "Eland 1959" a 1959 Flight article

На других языках

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- [en] Napier Eland

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[fr] Napier Eland

Le Napier Eland était un turbomoteur et un turbopropulseur britannique, construit par la société Napier & Son au début des années 1950. Sa production cessa en 1961, quand la société fut rachetée par Rolls-Royce Limited[2].

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[it] Napier Eland

Il Napier Eland fu un motore aeronautico a turbina sviluppato dalla Napier Aero Engines, divisione motoristica dell'azienda aeronautica britannica Napier & Son, nei primi anni cinquanta e commercializzato sia come turboalbero, per aeromobili ad ala rotante, che come turboelica per quelli ad ala fissa.

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