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Aviation History
1949
1949 - 1541.PDF
8 September, 1949 305 Com«t Whereas the maximum range of the Hermes IV is 2,820 miles, that of the Mk. VI (if the increase in disposable load is devoted to petrol) is 3,840 miles. Handle* Page Hermes V AN experimental development of theHermes IV, the Mk.V differs in being powered by four Bristol Theseus turbo- props. Two examples are on order and the first, now flying, should appear at Farn- borough. Span, 118ft; length, 97ft; gross weight, 84,000 Ib;max. speed, 351 m.p.h. at 15,000ft; cruising speed, 849 m.p.h. at 25,000ft; initial rate of climb, 1,950ft/min; range, 2,000 miles at 335 m.p.h. at 30,000ft. Handle* Page marathon I HPHE first production batch of this Mark-1- of Marathon (4 D.H. Gipsy Queen) totals 40 aircraft. Designed for short- andmedium-range passenger transport, the Marathon accommodates up to 22 pas-sengers and their luggage, but a 20-seater version will probably be standardised byB.E.A. The advantages of a four-engine layout for passenger flying are well known,and the ability of the Marathon to exceed the proposed 1952 I.C.A.O. safety require-ments should become increasingly im- portant. As a freighter the machinehandles a payload of 4,000 lb for 500 miles. The main cabin measures 18ft in length,is 7ft 9in wide, and from 6ft to 6ft 9in high. All-metal construction is used through-out; wing and fuselage alike are built in nve sections, and the wing is mounted above the fuselage to allow maximumcabin space. Pneumatically-operated high- lift flaps extend over nearly two-thirds ofthe span and contribute greatly to the Marathon's excellent take-off and landingperformance. They have a pronounced rearward travel before tilting downwards. Span, 65ft; lengt h, 52ft 1 Vi in; wing area, 498 sq ft; gross weight, 18,000 lb; sea-level rate of climb, 683ft/min; max. cruising speed, 209 m.p.h. at 10,000ft; service ceiling, 18,400ft. Handle*- Page Marathon II Tj»XCEPTIONALLY fine performance is XZ/ a characteristic of this development of the Marathon I, powered by two Arm- strong Siddeley Mamba turboprops and therefore having available some 640 h.p. more than the earlier mark. In service it would probably fly high enough to need pressurisation, and the fuselage is stressed for a pressure differential of some 2yt lb/sq in. Flying at 10,000ft, the Marathon II will cruise at 260 m.p.h. Initial rate of climbis2,100ft/min. The thin wing of the Marathon prevents the jet pipe of the Mamba from being buried within the aerofoil section; con- sequently, it must be carried over the top of the wing. To test the aerodynamic effects this installation would have, a •^ scale nacelle was built of plywood and fitted to the wing of a Miles Aerovan. It will be noted that on the four-engined Mk. I Marathon the flap operating mechan- ism is installed in the rear of each nacelle, but because the Mamba Marathon has only two nacelles, a fairing containing the flap mechanism is fitted near the trailingedge in place of the outboard engine nacelle fairing. Percival Prince READILY adaptable for freight-carry-ing, survey, ambulance work, execu- tive travel, pest control or training, thePrince is primarily a capacious 8/12- passenger feederline and charter aircraft.Over 2,000 lb of freight can be carried, with fuel for a range of 750 miles. Indica-tive of roominess is the unobstructed height of 6ft. Two Alvis Leonides 501/4engines are standardised. Outstanding among the attractions ofthe Prince is the exceptional roominess, qniet, and comfort of the cabin. Anadjustable armchair is provided for each passenger, together with individual light-ing, ash tray, and ample leg and head room. Each passenger, moreover, has hisown window and the high-wing design affords an excellent view of the ground andprotects against the sun's heat—an impor- tant consideration when operating in thetropics. The luggage compartment, with separate communicating door, is of72 cu ft capacity. The standard Prince has been designed for quick convertibilityfor freight carrying; to this end the toilet compartment can be entirely dismantledin a very short time and the total cabin volume thus available is 620 cu ft. Span, 5«ft; length, 42ft lOin; gross weight,10,650 lb; max. speod, 222 m.p.h. at 5,000ft; max. cruising speed (weak mixture), 179 m.p.h.; still-airrange at most economical power, 743 miles.
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