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Aviation History
1942
1942 - 0596.PDF
25° FLIGHT MARCH 19TH, 1942 An attfm-t to combine tractor cleanness with pusher engine was the Shackleton-Lee Murray S.M.i (top). The Vickers-Supermarine Walrus amphibian boat is a pusher type still in use. The centres of thrust and resistance are kept reasonably in line by the use of biplane wings. A variant of the orthodox clean modern tractor type is the Airacobra, in which the engine is situated behind the pilot and drives the airscrew through an extension shaft. rather, coolers, lay close against the fuselage sides. Although it has nothing to do with the subject of this article, it may be of interest to recall that Levavasseur designed the first monoplane with cantilever wings and "trou sered " undercarriage. That bearded old genius certainly had the right ideas. The Avro triplane with a 9 h.p. J.A.P. en gine was also of the tractor type. To get a good view "A. V." placed the pilot's seat aft of the wings. The light engine in front was not able to counterbalance the pilot's weight, and so Mr. Roe made his tail carry a considerable load. It was probably this fact which made the machine somewhat tricky on its controls. - While many other designers continued to produce pushers, Mr. Roe stuck to his guns, and from his early triplane may be said to have been developed all the tractor biplanes which formed the backbone of British aviation until the type was ousted, not so many years ago, by the cantilever monoplane. There is no gainsaying the fact that the tractor could be made much '' cleaner'' aerodynamically than the pusher. Or at least it was easier to make cleati. The old pusher, in order to get airscrew In the Westland-Hill Pterodactyl the absence of a tail made coincidence of the centres of thrust and resistance possible, an ideal difficult to achieve in a " tailed '' pusher.
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