GB432124A - Improvements in aircraft of the helicopter type - Google Patents

Abstract

432,124. Aircraft with rotary wing systems. ASBOTH, O., 1, Gower Street, London. Oct. 18, 1933, No. 28864. [Class 4] In a wing for a rotating wing aircraft, the blades are formed so that the part situated near the axis of rotation has a zero or small, preferably negative, angle of incidence and the remaining part has a positive angle of incidence diminishing towards the wing tip. The smallangled part is equal to or less than half the length of the wing and may be adjusted rotatably or longitudinally about a longitudinal axis of the blade. As shown in Fig. 3, the inner parts 4 of the blades 4, 5 can be rocked on a longitudinal axis by links 6 attached to a sleeve 7 slidable on the shaft of the rotating wing system. In the arrangement shown in Fig. 5, the wing formed with the two-part blades 4, 5 is combined with a wing which has blades 41 with a small or zero angle of incidence and which can be disconnected from the shaft 8 when the upper wing is driven by an engine. In an alternative arrangement, Fig. 4 (not shown), the additional blades 4<1> are arranged between, and in the same plane as, the twopart blades 4, 5. In a further arrangement, Fig. 7, double-flap members 10 are attached to the rear edges 9 of the inner parts 4 of the blades. The opening of the flaps is controlled by links 18 carrying rollers 16 which engage with a cam sleeve 14, the position of which is controlled by a governor 12 driven from the shaft 11 of the rotating-wing system. The governor may be connected or disconnected from the shaft 11 under the control of an anemometer 13 which also controls the connection of the shaft 11 to the engine. The double flaps 10 which may be replaced by single flaps or ailerons may be moved longitudinally of the blade 4 and may be moved from their normal positions against the action of springs.