GB609313A - Improvements in or relating to aerofoil structures - Google Patents

Abstract

609,313. Aerofoil structures. BROADSMITH, N. E., BURGESS, D. G., GORDON, J. E., McMULLEN, P. L., PHILLIPS, L. N., QUINT, B. S. C., and WHITCUT, H. M. Sept. 24, 1945, Nos. 24754, 24756 and 24757. [Class 4] Aerofoil structures such as wings, ailerons, elevators and rudders have a fibrous filling comprising tubes extending between opposed surfaces formed by the skin. Individual tubes assembled together and bonded by glued joints along the lines of contact may form the filling. As shown in Fig. 4, the filling 23 of a wing may be a honeycomb structure of paper; sheets of paper are coated with spaced parallel strips of adhesive and assembled in stacks with the adhesive strips in staggered relation, the material being drawn out after setting of the adhesive to form a block. The adhesive may be a phenolic resinous bonding agent as described in Specification 609,315, [Group IV (a)] Blocks of filling are secured between ribs 21, 22 by adhesive and the skin 19, coated inside with glue, is sprung over the assembly, also coated with glue, and is secured at the edges. Air is withdrawn from the inside to press the skin in place, an enclosing bag being preferably employed. The wing is in two sections with connected spars 20, 25 shaped to form between them a duct for control rods &c. The skin is preferably made of resinated fibrous material and may be of increased section at the root end of the wing; when the skin is moulded from laminated material the thickness can be increased by extra layers at the root and metallic inserts 27, 28, 29, Fig. 5, placed between the laminations for use in anchoring the wing; or a single tapered insert may be used.