GB493655A - Improvements in and relating to aircraft - Google Patents

Abstract

493,655. Aerofoil with variable characteristics. NAAMLOOZE VENNOOTSCHAP DERDE HILLEGOMSCHE MAATSCHAPPIJ TOT EXPLOITATIE VAN ONROERENDE ZAKEN. June 28, 1937, No. 17920. Convention date, June 29, 1936. [Class 4] An aeroplane wing comprises two sections adapted when nested together to form a wing having an aerofoil section suitable for flight at cruising speed and adapted to be separated to form a slotted wing, the forward wing section moving forwardly and at least one section rotating about the lateral axis of the aeroplane during separation. A forward wing section 40, Figs. 1 and 2, is pivoted at 45 to one corner of a triangular rocking plate 49 pivotally mounted on fuselage 4 at 50 and carries a rearwardly extending arm 43 connected by a link 54 with a pivoted support 46 of rear wing section 41. The latter section is connected near its leading edge by a link 52 to corner 51 of plate 49 and carries landing flaps or ailerons 42 which are automatically depressed on relative movement between link 52 and the section 41. The links and supports are duplicated along the span. Separation and closure of the wing sections to the position of Fig. 2 are stated to occur automatically in dependance on the angle of incidence and the air forces acting on the wing, and no change of trim is experienced. The aerofoil combination of Fig. 2 is rotated to give a stable centre of pressure travel. Movement of the wing sections is damped by a dashpot connected to plate 49 and comprising two chambers interconnected by a throttle valve 14 which may be such as to give lesser resistance to closure than to separation.