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Aviation History
1939
1939 - 1248.PDF
APRIL 27, 1939 FLIGHT. Britain's most recent commercial machine is the De Havilland Flamingo, which has an excellent performance with two Bristol Perseus sleeve-valve engines. heavy. One type—the Ago Kurier—is of par ticularly advanced design and has Handley-Page automatic slots. With two 240 h.p. Argus engines a speed of nearly 210 m.p.h. is attain able. These smaller twin-engined types are not nor mally employed on scheduled services but rather j for charter work, though the evergreen De Havilland 89 (Rapide) has done much to open up new lines in various parts of the world. It is the twin-engined machine of 800 h.p. or more which does the majority of the serious scheduled transport work among the smaller commercial types. This class of aircraft is, perhaps, best exemplified by the Lockheed Electra, which seats up to ten passengers and will cruise at speeds between 170 and 195 m.p.h. on the power of two Pratt and Whitney Wasp in some respects the larger four-engined models are to be favoured. That there is likely to be a demand for the twin-engined commercial machine for some years to come is indicated by the large-scale production in this country of the De Havilland Flamingo, a machine of exceptional merit. Although the Flamingo does not make use of such devices as a tricycle undercarriage or leading edge slots it is of refined design. Two of its big selling points COMING IN : The machines shown about to land with flaps and wheels lowered are, reading across and down ward from the left, a Lockheed Electra, Heinkel He 111, Lockheed 14 and Douglas D.C.3. Particularly note worthy are the Fowler flaps on the Lockheed 14, which has a maximum speed in the neighbourhood of 260 m.p.h. and is fitted with two Wright Cyclone engines. Junior engines. More or less to the same formula there has appeared in America the Barkley Grow monoplane and the somewhat smaller and more economical Beechcraft Model 18. Lockheed's themselves have turned out the Model 12 with smaller dimen sions and the same power, though this model appeals more to the private pilot, business man or air force than to the commercial operator. The "Tricycle Timm " high-wing type is refreshing. There are few available types be tween the Electra class and the twin- engined models of 1,400-2,000 h.p., as represented by the De Havilland Flamingo, Douglas DC.2, 3 and 5, the Lockheed 14, Marcel Bloch 220, Junkers Ju 86 and Fiat G.18 V. Types such as these are bearing the brunt of the work on the major airlines, though The layout of the Savoia Marchetti S.M. 75 three-engined machine may be studied on the right. This model has been adopted by a number of airlines.
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