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Aviation History
1911
1911 - 0304.PDF
I/PCHT) whereas in principle the upturned trailing edge represents the lateral dihedral angle, the down-turned leading edge represents the gull's wing, which is an accepted method of obtaining lateral stability in side gusts. The general action is as follows: A side gust ordinarily lifts that side of the machine against which it first strikes, because of the aeroplane action of the planes considered in their attitude towards the gust and the consequent travel of the centre of pressure towards the virtual leading edge facing the gust, which involves an actual travel of the centre of pressure laterally from the real centre of gravity of the machine. Thus the machine cants over and the upset is emphasised with the dihedral angle, because the upturned wing offers an increasing surface for normal pressure. In the gull's wing method the remoter down-turned wing tip presents APRIL 8, 1911. the more effective surface to the gust and tends to counteract the lift due to the travel of the centre of pressure on the remainder of the plane. It is, in principle, little more or less than this idea which was tried by the Wright Brothers in some of their early gliding experiments. Like most things of this kind, however, there is all the difference between the broad principle and the detail of carrying it into effect on a practical machine. It is the detail that makes the Dunne monoplane such an original design. Among the other machines illustrated here with, the Piggott monoplane is a remarkable example of the ultra-stream-line body, for in it the engine, pilot and passenger are completely enclosed. The Nieuport monoplane is an example of the surfaced frame, which may be described as the practical stream-line body of the moment, and the Blackburn monoplane, which is an interesting British- built machine, is another example in the same category. STARTING TO. SEE THE OXFORD AND CAMBRIDGE BOAT RACE.—Mr. Grahame-White leaving Hendon on Saturday. 306
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