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Aviation History
1950
1950 - 1697.PDF
281 FLIGHT, 7 September 1950 SERIES 700 VISCOUNT COMFORT FOR THE PASSENGER AND CONVENIENCE FOR THE OPERATOR FEW new aircraft when they emerge from the factory find themselves in the enviable positionof the first Viscount 700, which was born, as it were, with some six hundred hours' flyingexperience at home and overseas on a similar, though shorter, prototype as its background. There are to be three production types of Viscount in the 700 Series : the 701, a 40-seater with • ; crew of three ; the 702A with the same passenger accommodation but a crew of only two and additional freight space ; and the 703, a 53-seater version with three crew for high-density traffic. Both B.O.A.C. and B.E.A. have indicated their intentions to operate Viscounts, and overleaf is a special colour cut-away drawing of the proposed B.E.A. Type 701. Viscount economics have also figured in the Corporations' recent reports and plans, while probable orders mentioned total about 40, of which 20 to 25 would be for B.E.A. and some 15 for B.O.A.C. (for B.W.I.A.). Among the Viscount's many talking points, passenger comfort is predominant. The airliner's extreme smoothness and quietness—in which it unquestionably surpasses all other aircraft now flying—together with its spaciousness, the modest luxury of the seating, and unusual, large elliptical windows (26in x ioin), are certain to impress passengers. Sufficient speed to reduce by one-third existing journey-times while flying at smooth, over-weather altitude not only means greater convenience but may indirectly lead to cheaper fares as a result of getting more work done in a given period. Air-conditioning and pressurization systems maintain a constant pre-set cabin air temperature •i/ between outside atmosphere limits of — 70 deg. F and -f 90 deg F, and at the normal operating height of 25,000ft, conditions equivalent to 5,000ft (6.5 lb/sq in) for 44 persons in the cabins. The latter figures represent a complete air-change every 2\ min, or 50 cu ft/min for each person. Qualities of particular interest to the operator include low maintenance time and costs and the unusual accessibility of the turboprop power units. In operation, an overhaul period of 800 hr for airframe, power plants and airscrews is anticipated for a start, and calculations of economics have been made on this assumption. Absence of vibration is responsible to a considerable extent for high instrument and component serviceability. Special attention has been paid to what is called indiscriminate loading, and provided that the freight load is distributed between the three forward and single aft holds in the prescribed manner, the passengers may be seated in any positions in the saloon. Up to 5,750 lb of freight can be accommodated in the holds. The Rolls-Royce Darts are quickly removable, self-contained units with close, petal-type cowlings of improved design. Some performance and cost curves for the aircraft appear below, and principal data for the Viscount 701 are tabulated on the next page. 0-115 OHO 0i05 0-100 200 250 300 200 KNOTS 250 300 KNOTS 350 The above curves of cruise performance for various percentage powers and weights are for IS,000ft (left) and 25,000ft (right) altitudes. The curves b«low have been compounded to show the optima in Viscount performance in terms of payload, cost, time and speed. MOCK DISTANCE (kilometres) 0 100 200 300 400 500 600 700 800 900 1.000 1J00 BLOCK DISTANCE (miles) Lb. Kg. t4,000 7000 12,000 M00 •'"'•• 5,000 4.000 4.000 6000 1000 4.000 2000 2000 IJOOO 6 5 4 I3 2 1 BLOCK DISTANCE (kilometres) _200_40j__600^800 A000 '200 1.400 1,600 1.800 2P00 2,200 Kt5 ^ ~~! 300 600 200 400 100 200 100 200 300 400 BLOCK DISTANCE (miles)
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