Patent GB-558006-A (GB)
Title: Improvements in or relating to the control surfaces of aircraft
IPC: B64C21/08
Filed: 1942-04-09
Abstract: 558,006. Controlling aircraft. FAIREY AVIATION CO., Ltd., HILTON, L. M., and CHAPLIN, H. E. April 9, 1942, No. 4668. [Class 4] An aircraft wing is provided with a two-part fullspan flap arranged to be housed in a recess in and to be lowered bodily below the level of the wing, the tip or outboard flap-part being capable also of independent movement to act as an aileron. The two parts of the flap may be moved simultaneously to various positions such as for cruising and landing and the inboard part may be capable of independent movement to a braking or diving position. An interceptor on the upper surface of the wing may be operated simultaneously with or independently of the aileron flap-part As shown, the flap comprises inboard and outboard parts c, d normally housed as shown in full-lines in a recess in the wing band carried by links e, f which may be swung about axes g, j on the wing and on a bracket k thereon so as to assume as shown in Fig. 4 for the part d cruising and landing positions d<SP>1</SP>, d<SP>2</SP> and an intermediate take-off position. The part d is pivoted at p to carrier links o connected to the links e, f at h, m and a link shown in operated positions i<SP>1</SP>, i<SP>2</SP> extends from a point on the part d to a bell-crank q, r pivoted at s to the wing whereby it may be given aileron movement about the pivot p as indicated at d<SP>11</SP>, d<SP>12</SP>, d<SP>21</SP>, d<SP>22</SP> by operation of the bell-crank by connections t, u, 12 to the joystick. An interceptor w pivoted at v on the wing is connected to the lever 12 so as to assume an operative position when the rear edge of the part d is moved upwardly about the pivot p thus increasing the action of the part d. Except when the flap-part d is turned about the pivot p, the link i<SP>1</SP>, i<SP>2</SP> is coincident with the link f and in the housed position of the part d, the pivot m is coaxial with the pivot s of the bellcrank so that in this position the interceptor w only is moved by operation of the cable u. The interceptor may instead be operated by separate control means. To enable the flap-part c to be inclined independently of the flap-part d from the cruising position to a braking or diving position c<SP>3</SP>, Fig. 5 a link f of the flap-part c may be suspended from the end 48 of a bell-crank 49 pivoted on the wing at the axis 46 of the upper end of the link e, the links e, f being connected to the flap-part at 47, 51 and the link f being operated to move the flap-part to the diving position c<SP>3</SP> by a hydraulic jack 20. The links e, f, of both flap-parts may be operated by longitudinal movement of a shaft g, Fig. 1, carrying on quick-pitch threads, nuts connected to the links as described in Specification 538,545. The valve 26 of the jack 21 that operates the shaft g is connected by linkage 25, 22, 27 to a crank 29 freely mounted on a pivot which also carries a crank 32 connected by linkage 33, 35, 38, 39 to the valve of the jack 20. An operating lever 31 on this pivot is guided by a quadrant having slots 41, 44 and a gate whereby the lever may be coupled to either of the cranks 32, 39. Means similar to that described for moving the flap-part c to the diving position (Fig. 5) may be provided for effecting aileron movement of the flap-part d and operating means to that shown in Fig. 4 for the flap-part c may be provided for the flap-part c.