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Aviation History
1918
1918 - 0679.PDF
JUNE 20, 1918. Fig. 5.—Front view of the de Havilland IV biplane. sists of stream line wire, while the external drift bracing takesthe form of cables. The wing fittings are, as in so many other English machines,very simply carried out. 3 mm. thick sheet steel plates at the outer plane struts, and 3 mm. and 2 mm. at the innerstruts, having lugs bent to the angle of the bracing wires, into which are riveted aluminium packing pieces hollowed out in the centre. Through these are passed 8 mm. steel bolts, which rest in the forked end of the spar bolts, the bracing wires keeping the struts in place. The struts for the top plane centre section are similarly attached. The fuselage is covered with ply wood up to a point behind Fig. 6 Rear view of the de Havilland IV biplane. are secured to the wing spars by two bolts. A large forked bolt passes through the centre of the spar while a second smaller one passes down the outside of the spar. The inter- plane struts, which are made of spruce, are of stream line section, and the inner struts are kept stronger than the outer ones. On the ends of the struts are short sheet steel shoes the gunner's cockpit, this part being built up without the use of diagonal bracing. The longerons are of spruce and the engine bearers of ash. The formers as well as supports for controls and machine guns are made of ply-wood, some of which is 13-ply and as much as 26 mm. thick. The fittings for the attachment of the lift wires are each connected with Fig. 7.—Side view of the de Havilland IV biplane. 677
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