GB258841A - Improvements in or relating to girders, particularly those used as aircraft wings - Google Patents

Abstract

258,841. Kahn, L. L. Sept. 23, 1925, [Convention date]. Planes, construction of; framework. - Light girders, particularly for aircraft, and aircraft wings are built up with an outer casing for resisting compression stresses and systems of inner tension members connected to the outer casing in perpendicular directions only, one system adapted to exert compressive stresses on the casing in a. direction to produce bending and the other at right angles to the first system for preventing the said bending. Fig. 1 shows a girder with two outer plates 1, 2 and inner tension members 3, 4. When used as a wing the main tension member is arranged in the direction of the span. Where the outer casing presents a concave portion it may be strengthened on the inside by ribs secured to the inner surface. Fig. 5 shows a wing profile built up from wood strips glued together with large contacting surfaces, the wasts beyond the dotted lines 7, 8 being trimmed off. At the roots of the wing the strips converge to form one or two solid members for attachment to the fuselage. The wing is formed in two halves secured together along the line a, b by glueing, fabric covering, or veneer casing. Fig. 9 shows a wing profile built up from wood veneer. Double planking may be used to increase resistance to bending and to diminish the number of inner tension members. According to the Specification as open to inspection under Sect. 91 (3) (a) the inner tension members may be omitted from the wing shown in Fig. 5. This statement does not appear in the Specification as accepted.