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Aviation History
1961
1961 - 1202.PDF
FLIGHT,31 August 1961 &AC One-Eleven (artist's impression) BAC 107 (artist's impression) BAC One-Eleven This jet successor to the Viscount was announced in May 1961, at the same time as an order for ten, plus an option on five, was announced by British United Airways, Britain's biggest independent. Interest in the One-Eleven (two Rolls-Royce Spey turbofans) has also been declared publicly by three US airlines: Continental, Ozark and Frontier. It is essentially a jet successor to the Viscount, being comparable in size and seating capacity to the Viscount 810, but of course having a cruising speed some 150 m.p.h. greater. The One-Eleven springs from the earlier Hunting 107 project, now a BAC project (see below). The aircraft is the first to be tackled by the British Aircraft Corporation as a unified company and is a co-operative design and production effort involving Vickers, Hunting and Bristol. Being intended for short-haul operations—that is to say for stages down to 200 miles—the One-Eleven has a high landing weight in relation to take-off weight. The figures respectively are 65,0001b and 68,2501b. A longer range version of the aircraft is envisaged, having a maximum weight of 73,5001b, this version having centre-section fuel tankage. An airfield capability of 5,000ft to 6,000ft was a basic design target, and a wing area of 980 sq ft—about the same as that of the Viscount—ensures moderate approach speeds of some 2kt less than that of the Viscount. Though not ultra high subsonic, since the economic penalties of drag rise would not be justified in a short-stage aircraft of this class, the One-Eleven cruises at 540 m.p.h. at 25,OOOft. Maximum payload of 14,0001b can be carried over stages of up to 700 miles with full fuel reserves and up to 1,250 miles with a reduced payload of about 10,0001b. In terms of cost per aircraft mile the One-Eleven not only competes with the Viscount 810, but is actually cheaper than that aircraft down to stages of below 200 miles. The One-Eleven is the first British airliner to have a rear passenger ventral door, incorporating a hydraulically operated stairway. Maximum seating accommodation, five-abreast at 37in pitch, is 69. BAC 107 Very little has been published about this aircraft, which is a project only at the present time. It would be the smallest member of the BAC rear-engined jet family, based on two Bristol Siddeley BS.75 turbofans. Depending on market demand, time-scale would be a year or two after the BAC One-Eleven; the engines will be ready earlier. Vanguard Introduced into full service by BEA and TCA in the spring of this year, the Vanguard is probably the most economic turboprop airliner yet conceived. It is essentially suitable for routes of high traffic density where jet speeds are not a competitive factor. BEA plans to exploit the aircraft fully, depending on the outcome of Air Transport
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