|Napier Eland on display at the Helicopter Museum (Weston).|
|Manufacturer||Napier & Son|
|Major applications||Fairey Rotodyne|
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.
Design and development
The Eland was first tested in 1953 in a Vickers Varsity aircraft. Further flight proving was carried out from 1955 using the first production Airspeed Ambassador 2. The Eland was dropped from production when Napiers was acquired by Rolls-Royce Limited in 1961.
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(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.
- Eland N.El.1
- 2,690 hp (2,010 kW) + 825 lbf (3.67 kN) residual thrust, static at sea level ICAN conditions.
- 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.
- Eland N.El.4
- 3,765 hp (2,808 kW) + 610 lbf (2.71 kN) residual thrust, static at sea level ICAN conditions.
- Eland N.El.6
- Eland N.El.7
- The 504 adapted to helicopter / convertiplane, compressed air generator use.
- Eland E.211
- The 504 adapted for mechanically driven helicopter rotors.
- Eland 504
- Eland 508
- 504 with increased max continuous rating.
- 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
Specifications (Eland N.El.6)
Data from Flight 29 August 1958 p.340
- Type: Single-shaft turboprop
- Length: 120 in (3,000 mm)
- Diameter: 36 in (910 mm)
- Dry weight: 1,735 lb (787 kg)
- 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
- 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)
- Gunston 1989, p.107.
- "Napier Eland 504A", Atlantic Canada Aviation Museum, retrieved 2008-05-26
- Jackson 1973, p. 26
- "A History of Fairey Engineering", WFEL.co.uk, archived from the original (doc) on 16 March 2007, retrieved 26 May 2008
- Taylor, John W.R. FRHistS. ARAeS (1955). Jane's All the World's Aircraft 1955-56. London: Sampson, Low, Marston & Co Ltd.
- Bridgman, Leonard, ed. (1959). Jane's all the World's Aircraft 1959–60. London: Sampson Low, Marston & Co. Ltd.
- The Helicopter Museum - Fairey Rotodyne Retrieved: 28 July 2009
- "British Aero Engines 1958". Flight: 340. 29 August 1958. Retrieved 18 December 2017.
- Wilkinson, Paul H. (1959). Aircraft Engines of the World 1959/60 (1st ed.). Washington D.C.: Paul H. Wilkinson.
|Wikimedia Commons has media related to Napier Eland.|
- Atlantic Canada Aviation Museum - Napier Eland 504 information sheet
- "Eland 1959" a 1959 Flight article