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Aviation History
1915
1915 - 0573.PDF
AUGUST 6, 1915. (70111 —the tests showed 3 m.p.h. more than was calcu lated—load carrying and climbing, with a fair margin to spare. We are informed that during the tests the machine made consistent speed averages of 83 m.p.h., and climbed 3,650 ft. in 7 mins., carrying a load of 645 lbs. including pilot and passenger. The minimum speed has not been absolutely determined owing to the unsuitable nature of the flying ground, but low speeds of 40 m.p.h. have been obtained. The best gliding speed of the machine, as measured by the air speed indicator, is 61 m.p.h., and the most efficient gliding angle is 1 in 7. As nearly as was determined, the best air speed for a full load climb was 65 m.p.h. These figures were obtained with the Ogilvie air speed indicator, working in conjunction with several other instruments of Mr. Vought's own design. A glance at the illustration of the partly assembled fuselage, and also that of the wing frame, will reveal several interesting constructional details. For instance, in the case of the latter illustration, it will be seen that the ribs, which are constructed of 3-ply birch and mahogany, are not called upon to carry any compres sion stresses, functioning solely as load members. There are, however, three stout cross-struts between the spars which, together with the wire bracing, take all compres sion stresses. It will also be noticed that the spars are of substantial proportions, channelled out for light ness at intervals, and that the trailing edge is of steel tubing. Note should also be made of the steel fittings Two views of the 90 h.p. "Simplex" (Mavo) tractor biplane in flight. Below, just getting off with three passengers. Constructional details of the 90 h.p. "Simplex" (Mayo) tractor biplane.—Left: Two control arms, as fitted to the elevators, ailerons and rud ders. Right: The framework of one of the main planes. Note the cross struts for taking compression stresses. 573
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