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Aviation History
1950
1950 - 2201.PDF
Hoviltand Heron (foi THE YIELD OF THE YEAR . . . for the radio and radar, and in being fitted with the full de-icing system, using hot air tapped from the compressors of the Ghost turbojets. The 80-odd hours of flying since the first flight have been largely spent in testing the in- stallations named above, and it is expected that the work in hand will be completed before the aircraft (which, at the time of writing, is being upholstered and furnished) is loaned to B.O.A.C. early in the New Year for route trials. The third Comet—the first of the B.O.A.C. fleet of 14, and the first to be fitted permanently with the multi-wheel bogie undercarriage—emerged from the production hangar on November 17 th for fuel tank calibrations and engine runs. At the time of writing the first flight is imminent. This machine will be delivered to B.O.A.C. about the middle of 1951, and will be followed by others which should per- mit of public operation by Comets before the end of 1951. Announcement was made during the year of the inten- tion to develop a " Phase 2 " Comet with Rolls-Royce Avon or Armstrong Siddeley Sapphire axial-flow turbojets. In the development of this type emphasis would be placed on range, and such a machine would be able to fly the North Atlantic—on occasions direct—without recourse to flight refuelling. In Canada, work went ahead on the four-Derwent Avro Canada C-102 Jetliner, and by June more than 100 hours' test-flying had been completed. Level speeds of more than 500 m.p.h. have been attained during the year, and the cruising speed has been established as 450 m.p.h. A height of 39,500ft—9,500ft higher than the normal cruising height —has been attained. Many three-engined take-offs have been made at various speeds and at maximum gross weight. On a number of occasions the aircraft has been flown, with only one of its four Rolls-Royce Derwents operating, at about 200 m.pJi., with no loss of height observed. Several test flights were made over a triangular course of about 800 miles, and the average time was about two hours. These flights were made at normal cruising height and showed that about 1,600 Imperial gallons of fuel had been used. The production version of the Jetliner will have a fuel capacity Resplendent in its B.O.A.C. colours, the de Havilland Comet (four D.H. Ghost turbojets) is glimpsed on its way to the S.b.A.C. Display in September. '6-ALVG V" At
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