GB332568A - Improvements in or relating to light metal structures - Google Patents

Abstract

332,568. Bristol Aeroplane Co., Ltd., and Pollard, H. J. Feb. 21, 1929. Planes, construction of; framework.-An aeroplane wing or other light metal structure comprises a number of girders each constituted by a pair of oppositely directed channelshaped looms braced together with their open sides outermost, and forming the main strength members of the structure, and a sheet metal covering secured to the booms and providing a closure for their open sides. The booms may be formed of flanged quadrantal members 10 riveted to plates 12 to which bracing members 13 are riveted, a sheet metal covering 16 being riveted to the outer flanges of the booms. The structure may be reinforced by channel section ribs 17, 18 at right angles to the booms, fixed on the inside and outside of the covering. Either of these ribs may be omitted or discontinued at certain points, the rib 18 being shown discontinued at the parts where the booms are secured. To keep the stress at different sections constant, the booms may be laminated by adding an extra. thickness to either or both of the quadrantal sections where necessary. According to the Provisional Specification a wing or other structure may be built upon seven girders having hollow tubular booms formed of flanged curved strips riveted together or interlocked and braced together by channel members and gusset plates as described in Specification 309,110. Extra thicknesses of metal are applied singly or in pairs where required. The curved strips may be formed as single arcs or corrugated. The ribs comprise upper and lower formers supporting a fabric covering.