GB518513A - Improvements in the construction of aeroplane wings - Google Patents

Abstract

518,513. Aircraft wings. BRISTOL AEROPLANE CO., Ltd., and FRISE, L. G. June 17, 1938, No. 18100. [Class 4] A method of manufacturing a spar or other girder-like member for aircraft from straight strips of metal of uniform cross-section consists in cutting each strip obliquely to form two. tapering booms, each having at least one flat face, and fastening to such booms to a web so that a flat face of each booms engages a flat face of the web. The strip is shown in Fig. 1, Fig. 1a being a section. It is cut along the line 21 to give two identical tapering booms. Fig. 3 shows a plan of one boom. The part 23 is machined away to the line 24. By cutting a similar metal strip along the'other diagonal and machining as before, two further booms, of opposite hand to the first pair, are formed. One boom from each pair may then be taken and a tapering spar built up.by joining the booms 22 and 32 to a tapering web 35, Fig. 10. The chain dotted lines show the method of assembly for the spar of opposite hand from the remaining two booms. Alternatively, two booms of opposite hand may be produced from a single metal strip of asymmetrical section, as in Fig. 12a. A method of constructing a wing, shown in Fig. 11, consists of bracing the spar 32, 35, 22, forwardly by a stiff skin 36 constituting the leading edge of the wing. Rearward bracing is provided by a number of frames spaced along the wing and each comprising two tubes 37, 38, connected at their rear ends to a tube 39 running along the wing.