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Aviation History
1947
1947 - 0841.PDF
MAY 29TH, 1947 •480 The inner folding point of the port wing showing the simplicity of thehinges and latch. (Details in drawing opposite.) "S.28/43 outer wing was built round a single spar, was designed to fold ver- tically, and there are only three attachment points at each of the joints. Unlike the outer portions, the wing centre-section has two spars and extends one rib beyond the under- carriage attachment points. A centre- section front spar is structurally desir- able for several reasons, among which are the need to bridge the wells for the landing wheels in the root portions and to give anchorage for the leg attachment fittings. The one centre- section rib outboard of the under- carriage fittings on each side carries bomb rack fittings which can be loaded easily when the wings are folded. Pro- vision for carriage of a torpedo, at its release angle, was made in the original design, and by comparison with that of the Firebrand the S.28/43 centre- section has been much simplified. Outboard of the first break the wing is of laminar-flow section and therefore * has its thickest point towards the trailing edge (at about 60 per cent chord). This suits the single-spar layout well, for torsionally stiff structures can be built around and forward of the spar, and at the same time structural members do not tend to interfere with the large cavities required in the wings to contain the fuel , tanks. For simplicity and lightness the three-point attach- ment is also good. A large rear hinge, latch pin and fitting attach directly to tn'e spar, and in front, completing the OUTERHINGES triangle, there is a second smaller hinge. These compara- tively simple joint fittings and the ribs extending in one piece forward of the single main spar—thus eliminating numerous small brackets and fittings which are usually required to attach nose and centre rib sections to the front spar—are to a great extent responsible for the commend- ably low structural weight of the wing. Location and inter- rib stiffening in the centre cuts are provided by the walls of the fuel tank cavities. Ribs for the outer wing sections are simple pressed AUXILIARY FLAP
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