The Eland series of gas turbine engines were a 1950s product of D Napier & Son Limited. It was originally a small diameter single shaft turboprop which first ran in 1952. In 1956 it was type tested in the Vickers Varsity, Airspeed Ambassador and Convair 340 and 440 transports.
The engine was not a huge success in the UK being fitted in the Fairey Rototdyne and Westland Westminster Helicopters. It was much more successful in Canada where it was fitted in a series of Convair aircraft for commercial and miltary use.
The Eland E.211 was a design for production versions of the Westland Westminster was an adaption of the Eland 504 model specifically designed for helicopter operations. It featured a mechanically driven rotor system and differed from the 504 in having the reduction gear removed and a rear drive through an hydraulic coupling, first used on the Napier Eland NEl.7.
The Westminster prototypes had basically similar Eland E.229 and E.229A engines.
Details of the E.211:
– Diameter 36 ins (91.6 cm)
– Length 125 ins (343 cm)
– Frontal Area 7.1 sq ft (0.66 sq m)
– Dry Weight 1,418 lb (643 kg) without output shaft and coupling.
– Max. Take Off Rating 3,590 shp plus 570 lb (3,810 hp & 259 kg) net jet thrust at 12,500 rpm
– One Hour Rating 2,920 shp plus 530 lb (3,125 hp & 240 kg) net jet thrust at 12,500 rpm
– Max. Continuous Rating 2,720 shp plus 520 lb (2,920 hp & 236 kg) net jet thrust at 12,500 rpm
– Max. Take Off Rating 3,590 shp plus 570 lb (3,810 hp & 240 kg) net jet thrust at 12,500 rpm
– Fuel Consumption At Maximum Take-off Output 0.60 lb per ehp/hr (0.270 kg per ehp/hr)
– Fuel Consumption At One Hour Rating 0.63 lb per ehp/hr (0.285 kg per ehp/hr)
– Fuel Consumption At Maximum Continuous Rating 0.645 lb per ehp/hr (0.293 kg per ehp/hr)
– Oil Consumption Per Hour 1 pint per hr (0.57 kg litres)