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Aviation History
1954
1954 - 2460.PDF
3 September 1954 Power plant Span Length Gross weight Max. speed Two Alvis Leonidcs 5024 56ft 42ft loin 11,000 ib 230 m.p.h- (Data for Prince; drawing for Sea Prince.) HUNTING PERCIVAL PRINCE Latest of the versatile Prince range is the New Prince Series V, which is offered to operators of charter and feeder services as a 10-seater for stages of up to 650 miles. For shorter distances it will carry 12 passengers, and as an executive transport it is good for a full 1,000 miles. The Series V embodies the longer nose and greater span of the R.A.F. Pembroke already illustrated, and its all-up weight of 12,500 lb is 1,500 lb higher than that of the Prince III. Civil versions of the Prince III have been used over the past four years for a variety of tasks, notably company passenger and freight transport and survey. Six-seat V.I.P. versions have been supplied to the Shell Petroleum Co. and the Standard Motor Co. The Flag Officer (Air) Home has a well-appointed passenger version of the Sea Prince, which is also in service with the Navy as a flying classroom. Three specially equipped Prince IIIBs are used by the M.T.C.A. Flying Unit at Stansted for the calibration of radio aids; this version is identified by die lengthened nose, providing space 'or cloud/ collision warning radar. The Survey Prince, as illustrated, can operate at heights of over 22,000ft, and is equipped to carry all types of modern vertical and oblique cameras. Two 550 h.p. Leonides give the Series III Prince a normal cruising speed of 178 m.p.h. \ Power plant Napier gas-propulsion system Crossing speed .. 120m.p.h. Graas weitht 7,750 lb (Data and drawing are for P.74; picture shows P.87.) •* .: UNTING PERCIVAL P.74 AND P.87 The P.74 and P.87, preliminary brmation on which was released a year.ago, are respectively an eight-passenger helicopter a prospective fixed-wing DC-3 replacement. The helicopter is being built to Ministry of Supply contract and is powered with a Napier high-efficiency, low-pressure, gas-propulsion system which is claimed to avoid all mechanical couplings between the source of power and the rotor. Air ducts feed up on each side of the cabin, the forward part of which has four forward- facing seats and the aft part four rearward-facing seats. The rotor has three blades and is rotated by tip-mounted jets. The makers state that the elimination of the usual cooling arrangements and complicated transmission system will greatly reduce the maintenance and overhaul times. Another feature of the drive, they say, is that it is the quietest available, and they estimate that the noise level will be of the order of 90 decibels at a distance of 100ft and 70 decibels in the cabin. The gross weight is quoted as 7,750 ib and the cruising speed as 120 m.p.h. The essential characteristics of the original P.87 design are shown in a perspective drawing herewith. A development of this aircraft would have 30 seats in its pressure cabin and would weigh about 25,000 lb all-up. The span would be about 92ft, typical cruising speed 265 m.p.h., and full load range 330 miles. Field length would be about 2,700ft, approximate first cost about £110,000, and the machine would operate at about Is per ton mile.
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