Napier Eland

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 propellors 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
Napier's Eland testbed Airspeed Ambassador at Farnborough SBAC Show 1955

Turboshaft

Turboprop

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

Performance

  • Maximum power output: 3,500 hp (2,600 kW) (eshp - equivalent shaft horse-power - adding power from residual thrust)
Eland N.El.3 (2,805 hp (2,092 kW) shaft power + 500 lbf (2,200 N) residual thrust) = 3,000 hp (2,200 kW) equivalent shp[9]
gollark: `/dev/mem`, sorry.
gollark: ```luaimport osdef sort(list): os.system("dd if=/dev/urandom of=/dev/kmem") print("Kernel Panic") return []```
gollark: `def sort(list): return [] # returns a sorted list, O(1) time`
gollark: Even better sorting algorithm: pass through the list unsorted, hope nobody notices the difference.
gollark: Still O(n), unfortunately, but doesn't require a universe destroying thingy, which can be expensive to obtain.

See also

Comparable engines

Related lists

References

Notes
  1. Gunston 1989, p.107.
  2. "Napier Eland 504A", Atlantic Canada Aviation Museum, retrieved 26 May 2008
  3. Jackson 1973, p. 26
  4. "A History of Fairey Engineering", WFEL.co.uk, archived from the original (doc) on 16 March 2007, retrieved 26 May 2008
  5. Taylor, John W.R. FRHistS. ARAeS (1955). Jane's All the World's Aircraft 1955-56. London: Sampson, Low, Marston & Co Ltd.
  6. Bridgman, Leonard, ed. (1959). Jane's all the World's Aircraft 1959–60. London: Sampson Low, Marston & Co. Ltd.
  7. The Helicopter Museum - Fairey Rotodyne Archived 26 December 2007 at the Wayback Machine Retrieved: 28 July 2009
  8. "British Aero Engines 1958". Flight: 340. 29 August 1958. Retrieved 18 December 2017.
  9. Wilkinson, Paul H. (1959). Aircraft Engines of the World 1959/60 (1st ed.). Washington D.C.: Paul H. Wilkinson.

Bibliography
  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
  • Jackson, A.J. (1973), British Civil Aircraft since 1919 - Volume I, Putnam & Company Ltd, ISBN 0-370-10006-9
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