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Aviation History
1920
1920 - 0379.PDF
APRIL I, 1920 Fig. 4. circular holes, and which is inclined at an angle to the wingspars. Four parallel strips lie along the lower surface of the wing, and connect the roots of each of the four lower sparsto the aileron bulkhead or to the trailing edge. Each is of 24 S.W.G. duralumin, 48 mm. wide, and is riveted at 10 cm.intervals to the lower wing covering. Between spars 1 and 3, and also between spars 3 and 5,two waved section strips, each 45 mm. wide, and of 29 S.W.G. duralumin, are riveted to the inside of the lower coveringparallel to the spars. These are all plainly visible in Fig. 2. All of the seven tubular spars are spliced. In the caseof the upper spars the splice occurs 1 m. 59 cm. from the root, and the diameter decreases from 45 mm. to 40 mm. Thelower spar splices are found 1 m. 27 cm. from the root, and the spar diameters before and after splice are 35 mm. and 30mm. respectively. The splices are similar to those described in connectionwith the Junker biplane, but, owing to the fact that the m m m Fig. 5 m as far as the plan view is concerned, but converge so that at the wing tip their extremities are almost in line. The wing section, taken at the wing root, is drawn to scale in Fig. 3, and on this diagram are marked the various letters that are referred to from time to time in this de- scription. From this point the section tapers consistently to the tips. The channel section piece marked A (24 S.W.G., outside diameter of the inner tube is not very much less thanthe internal diameter of the outer one, it has not been found necessary to press the outside tube to a square section.Arrows marked in Fig. 2 show four of the splices. The outer extremities of the spars are received in a channelstrip, which follows the junction of the corrugated covering and the riveted-on edge found at the wing tips. (See Fig. 4.) Fig. -.•/- 25 mm. wide and 15 cm. deep) may be regarded as an eighth spar, but it does not extend from end to end of the wing. It finishes at the bulkhead marked B in Fig. 2. This bulk- head, consisting of a channel sheet of aluminium, performs several important functions. Primarily, it supports the hinge necessary to the working of the aileron control, but it also closes the triangular gap which would otherwise be left where the aileron commences. It is attached by riveted strips to the spars numbered 5 and 6 in Fig. 3, and is, of course, roughly triangular in shape. The metal is of 20 S.W.G. The shape of the aileron is made clear in the scale drawings, and it will be noticed that its accommodation does not necessitate interference with any of the tubular spars. It is hinged to a channel section spar, which is lightened by The spars pass through holes in this strip, and are cut off squarely an inch or two beyond it. The ends are left open, and small angle pieces are riveted to spar and strip to com-
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