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Aviation History
1949
1949 - 1540.PDF
304 FLIGHT' Percival Prlnc* Handley Page Marathon II Britain's Aircraft - Civ it Types Chrislea Super Ace 4 A FOUR-SEATER private-owner orcharter type, with nosewheel under- carriage, the Super Ace, Series 4, is readilyconvertible into a small freighter or ambu- lance with a 700-lb payload. Data for thisnew version are :— Span, 36ft; length, 21ft 6in; wing area, 177 sq ft;gross weight, 2,500 lb; cruising speed, 110 m.p.h. at sea level; range, over 500 miles at 110 m.p.h. de Havilland Dove A ERODYNAMICALLY and structur- X*. ally the Dove is of very modern de- sign, an indication of efficiency being the cruising speed of 179 m.p.h. at 8,000ft on only 60 per cent, power from the two Gipsy Queen 70 engines. Basically an 8/11-seater light transport, the Dove is readily adaptable for training, survey and ambulance duties. Span, 57ft; length, 39ft 4in; wing area, 335 sq ft;gross weight, 8,500 Ib; max. speed, 210 m.p.h. at 8,000ft; initial rate of climb, 850ft/min de Havilland Comet BUILT to take advantage of the specialqualities of jet propulsion on the Atlantic and Empire routes of B.O.A.C., the revolutionary Comet carries 36 pas- sengers and a crew of four. Power plant is four de Havilland Ghost turbojets almost buried within the wing, close along- side the fuselage, and provision is made for rocket-assisted take-off. A cruising speed approaching 500 m.p.h. is expected, and in order to obtain the requisite economy it will be necessary for the Comet to fly at heights of the order of 40,000ft, entailing a high degree of pressurisation. The wing area is relatively large and sweep-back is moderate. At present the main under- carriage units have single wheels, of 66in diameter, but a four-wheel bogey type of undercarriage has been designed for later aircraft. In addition to two prototypes, 16 Comets are on order and a number of these should be in service during 1952. The Comet first flew on July 27; it is believed that full operational height and speed were achieved during the first 30 hr of testing. de Havilland Beaver A LIGHT all-metal single-enginedtransport of very robust construction, the Beaver was originally developed to meet Canadian "bush" requirements, but is evidently an attractive proposition for operators in many parts of the world. There is normally accommodation for pilot and four passengers, in quickly removable individual seats, and entrance doors in both port and starboard sides; a maximum of seven seats can, however, be provided, or, as a freighter, the Beaver offers 144 cu ft of stowage space. The Pratt and Whitney Wasp Junior engine is standard, and wheel and float undercarriages can be supplied. Landplane data are :— Span, 48ft; gross weight, 4,500 lb; max. cruisingspeed, 153 m.p.h. at 5,000ft; max. rate of climb at sea-level, l,310ft/min; landing speed, 50 m.p.h.;range, 480-645 miles. Fairey Junior AN ultra-light single-seater suitable foran engine of 35 to 50 h.p., the Juniorreproduces in every way the characteristics of a larger and more powerful machine. Construction is very robust and simple. Handley Page Hermes IVand VI OF truly modern post-war design, theHermes IV airliner will go into service on the Empire routes of B.O. A.C. Twenty- five examples are on order. By carrying only 40 passengers (a maximum of 63 can be seated if required), the Corporation will offer exceptional comfort. Cabin space totals over 2,000 cu ft, and the freight and baggage compartments have a volume of 402 cu ft. Four Bristol Hercules 763 fan- cooled engines, in special low-drag power plants, give a total take-off output of 8,400 h.p. Span, 113ft; length, 97ft; wing area, 1,408 sq ft;gross weight, 82,000 lb; max. speed, 357 m.p.h. at 20,000ft; max. cruising speed, 298 m.p.h. at 24,000ft;initial rate of climb, l,020ft/min; range, 2,000 miles at 298 m.p.h. at 26,000ft.The latest projected development of the Mk.IV is the Mk.VI, which benefits from recent advances in the production of light alloys and the payload of which is increased by over 2,000 lb. Other innovations are new high-efficiency flaps and thermal de- icing. Hercules 763 engines are retained.
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