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Aviation History
1949
1949 - 0740.PDF
April tith, 1949 FLIGHT Viekers VKcounf ?OO. Newest model of the world's first turboprop transport, the "700" is appreciably larger than the prototype Viscount, having a span and length respectively of 94 ft and 81 ft 2 in. The type has been designed to take advantage of Rolls-Royce Dart RDa. 3 turboprops, and the increased dimensions and higher power (4 x 1,420 h.p.) has allowed an increase in gross weight from 45,000 lb to 48,000 lb. Fuel capacity is now 1,800 gall. Two variants, known as the Model 40 and Model 52, will seat respectively 40 and 52 passengers—an important advance on the prototype, which accommodates 32 to 43 according to layout. The deep oval windows, which have proved so popular on the prototype have been retained. Not only are these extrernely efficient from the structural standpoint, but, being large in area, and forming emergency exits, are a great convenience and comfort to passengers. The Vickers seats are upholstered in moquette and Vynide. Under normal flight conditions virtually no vibration is Short Sealand Vickers Viscount (prototype) Short Solent experienced in the cabin of the Viscount. In comparison with the Viking, the noise level has been reduced by 20 decibels in the low-frequency range and 10 decibels in the , high-frequency range.. Two large entrance doors, separate pantry-provisioning and external toilet-servicing permit a quick turn-round between flights, and maintenance especially of the Dart power plants, is relatively easy. At maximum take-off weight, on 68 per cent power, the Viscount 700 cruises at 315 m.p.h. at 20,000 ft, and at 85 per cent max. weight, on the same power, but at a height of 25,000 ft, the speed is 327.5 m.p.h. At mean weight, at 25,000 ft, 1.45 statute air miles per gallon can be flown. The take-off distance to clear 50 ft (I.C.A.O. technique) is 1,146 yd, and the landing distance from 50 ft, 900 yd. Representatives of some of the most important home and overseas airlines have displayed interest in the Viscount and many have enjoyed demonstration flights. Special praise has been evoked by the silence and lack of vibration.
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