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Aviation History
1952
1952 - 2433.PDF
TWENTY-SIX Viscounts have been ordered by B.E.A., the first of which is due for delivery in October and introduction to service on the Continental routes early in 1953. For a brief period in 1950 B.E.A. used the prototype Viscount on regular services between London and Paris, so this type was actually the first turbine-powered airliner to carry tare-paying passengers. Further orders have been placed by Air France, Aer Lingus and Trans-Australian Airlines. The Series 700 Viscount (production type) is VfokerS'Armstrongs Viscount powered by four Rolls- Royce Dart 3s each rated at 1,400 b.h.p. plus 365-lb thrust, and the resulting maximum cruising speed is 342 m.p.h. at 23,000ft. Hypothetical flight plans for the Viscount in T.A.A. service have been compiled by the manufacturers, giving an interesting indication of the potentialities of the aircraft. An example of its abilities on a medium-length stage is the plan for the Townsville-Brisbane route (625 n.m.) assuming the following conditions : I.C.A.N. plus 15 deg centigrade, 70 per cent power for cruising at 20,000ft, reserve speed for keeping to schedule 20 kt, head wind 17 kt. Under these conditions the estimated block speed and block time are respectively 183 kt and 3.24 hr; fuel used works out at 6,527 lb, and water-methanol required for improved take-off performance is given as 700 lb. Operating cost of a 53-seat Viscount at 2,500 hr annual utilization is estimated as 1.27 pence per ton-mile. 29 August 1952 3 Gipsy Queen 70-4 61ft 6in 42ft ain 13ft 6in 358.6 sq ft
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