GB493762A - Improvements in or relating to aircraft - Google Patents

Abstract

493,762. Aeroplanes. BACK, W. E. March 13, 1937, No. 7387. [Class 4] An aeroplane includes main wings A B set at a dihedral angle, the centre c pressure of the outer part of each c which is in advance of, and the centre o pressure of the inner part of which is in rear of, the centre of gravity of th machine, ailerons A<3>, B<3> on the oute parts of the wings, and a stabilizing surface and a control surface D situated in rear of the centre of gravity. In on form, the wings are given wash-in and a vertical tail fin D<1> provided. Rotation of a hand wheel H moves ailerons A<3> differentially through, bevel gearing, sleeves G<4>, G, G<1>, levers J, J<1>, links J<2>, J<3>, levers J<4>, J<5> secured to pulleys J<6>, J<7> and cables J<8>, J9. Fore-andaft movement of the hand wheel moves the ailerons in the same sense and simultaneously, through levers F<2> and links F<3>, adjusts the elevators in the opposite sense. The sleeves C, G<1> are rotatable on a rod F<1> which is journalled in levers F mounted on a shaft E<2>. The shaft E<2> is rotated by means of a lever E<3> provided with a locking-detent; this has the effect of raising or lowering the shaft F<1> to adjust through links K, K<1>, levers K<2>, K<3> secured, respectively, to pulleys K<4>, K<5> and cables, and moving the wing flaps A<4>, B<4> together with the ailerons A<3>, B<3> in the same sense, no appreciable movement being given to the elevators. If the ailerons are actuated by servo-flaps, the aileron carries rigidly a surface A<5> to which is pivoted surfaces A<6>, A<7>. The surfaces A<7> are connected bv cables A<8> to fixed parts of the structure so that movement of the aileron is assisted by the concurrent deflection of the surfaces A<7>. The surfaces A<6> are actuated by cables led through the aileron pivot and passing over pulleys P<6>, p<7> which carry levers P<4>, P<5> respectively. The levers P<4>, P<5> are connected through links P<2>, P<3> to levers P, P<1> carried by sleeves N, N<1> rotatable on a shaft M rigidly carrying a member N<6> in which is journalled a shaft N<5> carrying a hand-lever O and a bevel gear N<4> which meshes with bevel gears N<2>, N<3> on the sleeves N, N<1>. Thus, fore-and-aft movement of the lever O actuates the surfaces A<6> to operate the ailerons in the same sense whilst lateral movement of the lever causes differential actuation. The shaft M is mounted in a frame L mounted on a shaft L<1> and connected with the lever E<3> through a link L<2>, lever L4 and a link L<6>. Thus, as shown, movement of the ailerons by the control E<3> is assisted by the servo-action of the surfaces A<6>. The lever O is provided with a locking-pin D<1> adapted to engage holes in the frame and when locked the surfaces A<6> co-operate with the surfaces A<5> to impart automatic balance to the aircraft. The ailerons, after control surfaces, the main control mechanism and the servo-control mechanism form a statically balanced system. An automatic pilot may be provided which may operate the servo - surfaces. Specifications 462,382, 485,794, and 493,836 are referred to.