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Aviation History
1910
1910 - 0479.PDF
THE, DUNNE AEROPLANE. Concluded from page 462.) IT has been said above that the wing is flat where it joins the body, but actually this is not the case, for although the wings are undoubtedly made up on the above-mentioned principle, which would give a flat section in the place indicated, a secondary consideration intro duces the necessity for a certain form of curvature in where in the middle of the wing, and negative at the tip. If the angle of incidence at the tip is positive, then the angle of the whole wing will be positive, and conversely if the angle at the root is negative then the angle of the entire wing will also be negative. Insufficient experience has been obtained to show what is exactly the normal "Flight" Copyright. General view of the Dunne aeroplane taken from behind. This illustration also shows the twist on the main decks in a very marked manner. this particular part of the wing, which, as a matter of fact, is extremely cambered at that point and for about two feet from the body. Here again, however, the camber is not uniform, and it is obtained entirely by deflecting the trailing edge. Its purpose, which has nothing whatever to do with the general action of the flying attitude of the Dunne aeroplane. Lieut. Dunne himself imagined that it would be such as to reverse the algebraic sign of the angle of incidence somewhere in the vicinity of the outer extremity of the wing, but some of those who were eye-witnesses of the flight declare that the datum line to which the trailing portion of the " Flight " Copyright. Side view of the Dunne biplane taken from in front and looking down one of the leading edges, The supplementary camber in the central portion of the trailing edge is illustrated in the above photograph. machine, nor with the general principle on which the wings as a whole are designed, will be referred to later. By the aid of the little paper model it is easy to appreciate that most important salient feature of the wings on the Dunne aeroplane, viz., that the angle of incidence becomes less towards the outer extremity of the wing. With a certain normal attitude it will even change its algebraic sign, being positive in the vicinity of the body, zero some- wing is parallel, was horizontal in flight, which would mean that the entire wing was flying with a negative angle of incidence. It may be mentioned that the entire machine is constructed to a datum line, which is carefully laid off in the body. The upper part of the body framework lies parallel to this line, and thus affords an easy mark of observation in flight. That portion of each wing which 477
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