GB342268A - Improvements in the structure of wings for aircraft - Google Patents

Abstract

342,268. Aircraft wing structures. WALLIS, B. N., Weybridge Works, Byfleet Road, Weybridge, Surrey. Oct. 26, 1929, No. 32574. [Class 4.] Aircraft wings having a framework comprising longitudinal spars and transverse ribs have stringers connected to the ribs in the direction of the span so that their outer surface projects outside the ribs, the outer surfaces of the stringers being so located that a fair curve surrounding them in the direction of the chord gives the required wing section, and a flexible outer covering which when attached does not contact with the ribs but assumes the required contour. A wing, Fig. 1, comprises a built-up spar 1 of the type described in Specification 334,405, [Class 4, Aeronautics], transverse ribs 4 supported at the junctions of the spar bays, stringers 8, and an outer covering 14. The stringers 8 are arranged to conform with the wing shape for instance as shown in Fig. 1 and the spacing between them is adjusted to suit the aerodynamic loading at different points in the chord. When fabric covering is used light flexible battens may be arranged transversely or diagonally with respect to the stringers. Each rib 4, Fig. 2, comprises wire braced leading and trailing edge sections and upper and lower centre sections, each section being secured by plates 9 to the flanges of spar strengthening sleeves 2. The ribs comprise angle members 4a, 4b, Fig. 2, connected by pressed bracing pieces 4c. The stringers are of similar construction having flanges 8a, 8b and are secured to the ribs by angle-strips 10 riveted to the members 4a, 4b. The ribs need not be shaped to the profile, this being determined by the arrangement of the stringers. The tubular spars may be formed from helically wound strip metal.