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Aviation History
1938
1938 - 1162.PDF
404 FLIGHT. APRIL 28, 1938. Mercury, the shapely upper component of the Mayo Composite aircraft. This machine,should make the transatlantic trip this year. The engines are four Napier Rapiers.' • by the manufacturers that, from the point of cleanness of form, speed efficiency, and, therefore, speed economy, this machine has proved to be the most economical cf its class in the world to-day. During the past few months the D.H. Gipsy Twelve in- verted vee air-cooled engine, which is specified, has satis- factorily completed its civil and military type approval tests. The Gipsy Twelve is cooled by a special pressure- duct system wherein cooling air is taken in through orifices in the leading edge and led round from the back of the engine De Havilland constant-speed airscrews are standard. The mail-carrier version, two examples of which have been ordered for transatlantic experiments, has a range of about 2,500 miles against a head wind of 40 m.p.h. with a pay load of about 1,000 lb. ; the passenger version will have a range of about 1,000 miles with 22 or 23 passengers, a crew of four and a liberal allowance for baggage freight and mails. The cruising speed is about 210 m.p.h. Indications are that the D.H.86B economical four- engined "branch-line" machine, which cruises at about 140 m.p.h., with a disposable load of 4,000 lb., will con- tinue to be popular. The engines are, of course, D.H. Gipsy Sixes of 200 h.p. each. The D.H. 89A, or Dragon Rapide, twin-engined model in its 1938 form is licensed for an all-up weight of 5,500 lb. A number of improvements have been introduced. Both the 86 and the Rapide have been supplied in im- pressive quantities not only to well established air lines in need of economical feeder and charter types, but for development flying on new routes. Their tapered wings and '' trousered'' undercarriage are familiar on many European aerodromes. Smaller than the Rapide, the D.H. go, or Dragonfly, with two Gipsy Majors, is an attractive type for charter and feeder work. Makers: The De Havilland Aircraft Co., Ltd., Hatfield Aerodrome, Herts. HESTON ^TAKING advantage of the Series II D.H. Gipsy Six •*• engine and two-position variable-pitch airscrew, the 1 An adaptable feeder-line or charter type is the Cheetah-powered AVro 6S*.
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