Patent GB-528808-A (GB)
Title: Improvements in or relating to lift increasing devices for aircraft
IPC: B64C21/08
Filed: 1939-05-12
Abstract: 528,808. Controlling aircraft. TAMPIER, R. May 12, 1939, No. 14185. Convention date, May 17, 1938. [Class 4] An aeroplane having an auxiliary surface movable relatively to the wing to provide increased lift has the auxiliary surface, comprising one or more parts, supported at all times on an engine mounting or upon the fuselage or on both. In one form, aircraft wing flaps A are formed of parts A<1>, A<2> hinged to spars 6. The part A<2> may be divided to form a further hinged surface A<3>. The spars 6 are displaceable along inclined guides in the nacelles in order to move the flaps from a nested to an extended position on operation of screw-and-nut mechanism 13 carried by the engine mounting and which may be actuated through clutches 21, 22 from the aero engines. The spars 6 may further be guided in the fuselage. The incidence of the parts A<2>, A<3> may be controlled by the pilot through hinge mechanism 23, 24, Fig. 7, similar to that described in Specification 496,875. Ailerons 4 may be provided on the wings 1 and may be operated through hinge mechanism similar to that described in Specification 499,503. The ailerons are operated through a rod 80, Figs. 19 and 20, connected through an arm 86 to a torsion shaft 85 which carries an arm 84 which engages a rod 87. The rod 87 may be coupled to a rod 93, guided by rods 95, by means of a rotatable sleeve 89 which carries an arm 90 adapted to engage, according to the position of the flap, in one of two notches 96, 97 in the rod 93. The hinges for the surface A<3> are controlled through the rod 93. Thus the parts A<3> and 4 may be moved together. The spars 6 are relieved of torsion by rollers or slides 28, 29 which engage slots 11 in the fuselage or engine nacelle. The screw-and-nut mechanism may be duplicated at the fuselage. An axle 31 on the part A<1> may engage a guide 30, the lower end of which is designed so that pivotal movement of the part is permissible in the extended position. In modifications the screw-and-nut mechanism is replaced by an endless chain driven by a motor, a hydraulicjack or rack-and-pinion mechanism. The spars 6 may be locked in position by mechanism similar to that described in Specification 494,579. The control for the parts A<2> may be coupled with that of the elevators so that the flaps and elevators may act in the same direction or the elevators may be arranged to relieve the load on the flaps. Alternatively the parts A<2> may be coupled with balance flaps on the elevators. The flaps may be disposed at the leading edge of the wings in which case they are displaceable upwardly and forwardly. Flaps 34, Fig. 10, may be arranged to cover the leading edges of the parts A<1> when in their retracted position. These flaps may be controlled manually or automatically by movement of the flaps A and as shown a bell-crank lever 37 contacts the leading edge of the part A<1> and co-operates with a spring urged link 39 provided with notches 41, 42 to hold the flap in its retracted or extended position. The bellcrank lever 37 may be locked by mechanism similar to that described in Specification 494.579. The flaps may consist of single surfaces only. In another modification the auxiliary surface is mounted on two separate spars one on each side of the fuselage and each supported in an engine mounting only. In a further modification the surfaces are mounted on a single spar extending through and supported only by the fuselage.