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Aviation History
1918
1918 - 0570.PDF
which occur at certain intervals along the spar. These partitions are made up of four strips of spruce, halved together and glued. The ribs have spruce flanges and very thin webs of three-ply wood, approxi- mately i mm. thick. \ 23, 1.918. are secured to front and rear faces respectively of the spar, by two horizontal bolts passing through the spar. To the bottom end of each plate is welded a small lug, internally threaded, into which is screwed a vertical bolt, the other end of which passes through Fife. 12 Details of the wing tip and its skid on the Fokker triplane. The leading edge is formed by a long strip of three- ply, wrapped around the nose of the ribs, and cut out in triangular shapes, the apices of which are secured to the top of the spar. As shown in the scale drawings of the Fokker tri- plane (published in our issue of May 2nd), the upper wing is supported from the body on two inverted a lug on the strut structure and is secured in position by locknuts. It will be seen that by suitably adjusting the bolts securing the spar, the angle of incidence may be slightly varied. To the left of the strut attach- ment will be seen the pulleys for the wing flap cables, which run from this point to the cranks of the rocking-shaft in the body. Fig. 13.—Attachments of wing spars to body on the Fokker triplane. On the left is shown the attach-ment of the bottom plane, while the sketch on the right shows how the middle plane is secured to the top body rails. Vees of steel tubing, sloping outward at a considerable Mention has already been made of the fact^that angle. Details of the attachment of the apex of the interplane struts are extremely thin, and are in the Vee to the top spar are shown in the two sketches effect ties rather than struts. They are made^of at the bottom of Fig. 11. Two channel section plates wood, and the attachment to the spars is shown* in 568
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