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Aviation History
1920
1920 - 0378.PDF
CHf] • /,;..;' , ..™...._.:~~tr- APRIL I, 1920 * Three - quarter rear view «f a damaged Junker * . a* monoplane Front view of a damaged Junker D 1 monoplane The difference lies in the fact that, whereas in the biplane the interspar bracing is of duralumin tubes (except at the extreme tips, where strips are substituted), in the monoplane wings strips are used throughout the length of the plane. The bracing strips are all similar in shape, but vary in length and thickness of metal according to position. Near Fig.l.—Section of corrugated aluminium covering, actual size the root the thickness is -033 (about 21 S.W.G.). The section drawn in Fig. 1 is only found in the middle portion of the strip. From this section the strips gradually flatten out, so that at the extremities, where they are riveted to the spars, they are practically flat. The arrangement of the bracing is worthy of "attention. Each of the three upper spars is connected to the two ad- jacent lower spars in such a manner as to form a Warren girder, and the upper apices coincide, so that the arrange- ment may be otherwise described as a series of alternately inverted square pyramids of bracing strips. Fig. 2 will explain this, and will show that no bracing Fig. 3 strips are found between any two adjacent upper spars or between any two adjacent lower spars. It will be understood, therefore, that .the corrugated covering completes the system of triangulation upon which the strength of the structure depends. The seven spars are parallel throughout their whole length Fig. 2. 378
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