GB147734A - Hollow supporting surface for flying machines - Google Patents

Abstract

147,734. Junkers, H. Dec. 22, 1916, [Convention date]. Planes, construction of. - Planes for flying-machines are formed with lattice girder spans rigidly connected to a corrugated sheet-metal envelope without the. use of ribs or external bracing, the corrugations extending in the direction of flight. Figs 1 and 2 show longitudinal and transverse sections of a wing in which spars comprising upper and lower tubes 1, 2 united by vertical and inclined tubes 3, 4 are riveted directly to a corrugated metal envelope 6. Adjacent spars are connected together by diagonal braces 5. A modification is described in which the upper and lower booms are in staggered relation and braced only by diagonal members forming approximately equilateral triangles. The tubes taper in diameter or thickness of wall towards the wing tips. The leading edge of the plane where the curvature is sharp may be formed as a separate piece corrugated as shown in Fig. 17 so that the corrugations on the upper and lower surfaces of the plane are offset in order that they nest together at the rear edges of the plane, where they are secured over a wood filling-piece 28 as shown in Fig. 13. Alternatively, the leading edge may be made straight at the extreme front with gradually deeper corrugations towards its junction with the main surfaces, or it may be of trough form with straight edges joined to the main coverings, the corrugations of which diminish in depth towards the junction. The covering may be riveted directly to the tubes 1, 2 of the spars or to reinforcing-pieces 16 or 21, Figs. 8 and 10, clamped to the tubes. The covering may have an extra deep corrugation 9, Fig. 6, at intervals, or additional strengthening-pieces 10, corrugated at 11, may be applied to the surface either continuously on the outside or between adjacent spars on the inside. Rudders, fins, &e. may also be formed in this manner.