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Aviation History
1914
1914 - 0744.PDF
JULY IO, 1914. Edited by V. E. The Model Engineer Competition. Mr. H- G. Bond's Model. THE following particulars and accompanying illustration of the winning model in the above competition will, we are sure, not be without interest to the readers of FLIGHT :—Loading, 6-5 ozs. per sq. Mr, H- G. Bond, the winner of the Model Engineer Competi tion, and his model. ft.; length of model, 42 ins. ; wing span, 39 ins.; chord, 475 ins. Driven by 7 strands of i in. strip rubber. Diameter of propellers, 11 ins. Chassis and apex of hard aluminium. B.G. lubricant was used on the rubber motor. Dimensions of elevator, 11 ins. by 3 ins. JOHNSON, M.A. Model Drawings. Mr. G. Morgan, Southampton Street, Ringwood, Hants, would be glad to accept Mr. Wyatt's offer of drawings of his models and of his compressed air motor, recently described in FLIGHT. Mr. W. G. Billlnghurst's Model Flying Boat as Exhibited at Olympia, 1914. The boat orjuselage is composed of a framework of silver-spruce 30 ins. long, 2 ins. in width and if ins. deep, covered with silk given a varying number of coats of varnish in accordance with the part where applied. There are four longitudinals having an uninterrupted run for the whole length of the boat, the upper ones being ^ in. square and the lower ones \ in. by ^ in. (lying flatwise). There are three steps, spaced equidistant apart, with a distance piece at the rear ot each, cut out for lightness. The foremost of these is extended upwards to form the foundation of a dashboard. Built into the boat is a strong framework to which the planes are attached, which at the same time provides a clearance of \\ ins. for the planes from the water line. 1 The planes are set at a positive angle of 3°, and are constructed of 18 gauge steel wire covered with Jap silk and varnished three times. The dimensions are as follows :— Span. Chord. Max. Camber. Upper plane 36 ins. 5J ins. f in. Lower plane 24 ,, 5 „ | ,, Tail plane 10 ,, $\ „ Nil The two main planes are separated by eight streamline wood struts, which provide a vertical gap of 6 ins. and a Stagger of 2 ins., and are cross-braced with fine straining wire. The tail is set at a slight negative angle of incidence, and tends to further enhance the longitudinal stability by means of its action relative to the propeller slip-stream in which L is working. As is obvious in this type of model the centre of thrust is considerably higher up than the centre of gravity and centre of resistance. This being so, immediately the propeller is started the nose of the machine tends to go down, but the slip-stream depresses the tail and so counter-balances that effect. When the propeller stops, and a glide is commenced the weight swings forward, but the tail— now minus the extra depression—rises to bring the model back to its normal flying attitude. Power is provided by 8 strands of J-in. strip rubber carried on a U section motor rod 33 inches long, and driving a single 8-in. propeller (by J. Bonn and Co., Ltd.) at 1,500 r.p.m. The tests of the model have been exceedingly interesting, and many valuable and educational points have been discovered, mainly with regard to the boat. Short hand-launched flights have been obtained, but it has, as yet, refused to quit the water entirely under its own power, although this accomplishment only appears to be a matter of more experiment. On the strength of the information MR. L. H. SLAT^ MODELS--LeEt his r.og. machine in flight; centre, his hydro-aeroplane flying on Wimbledon Common? and on the right his weight-lifting model in flight. 744
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