Patent GB-573953-A (GB)
Title: Training equipment for aviators
IPC: G09B9/18
Filed: 1942-10-21
Abstract: 573,953. Training aviators. WEST, R. L. Oct. 21, 1942, No. 11821. Convention date, Feb. 11. [Class 4] A trainer of the kind comprising a dummy cockpit movable under the control of a rudder bar and lever and fitted with dummy flying instruments is fitted with means for simulating the effect upon the movements of the cockpit and upon the readings of the flying instruments of the failure of any of twin or multiple engines supposed to be fitted or of the unequal actuation of the corresponding throttle levers, and also with means for simulating the effect produced by actuation of the pitch control arms of normally constant - speed, variable - pitch propellers. Levers simulating mixture setters also are fitted. Two dummy throttle control levers 10, 11, Fig. 2, are respectively connected to the elements 14, 15 of two differential devices comprising meshing toothed sectors 14, 16 and 15, 17 mounted on two levers 20, 21 pivoted at points midway between the pivots of the toothed sectors. The elements 16, 17 are movable by the instructor from outside the cockpit by members 18, 19 to simulate unexpected failure of either engine. The arms 20, 21 are connected by links 22, 23 to arms on master sectors 26, 27 on a master differential arm 28 and by links 32, 33 to opposite ends of a yoke 36 which is connected at its centre to a lever 38 for controlling the readings of a dummy air-speed indicator, and dummy vertical speed indicator and altimeter. A rudder bar 67 is coupled to one element 61 of a differential device acting upon the control valve T.V of the turning motor, and a wheel 45 on a control lever is coupled to an element 48 of another differential device acting upon the valve B.V for controlling the banking. The other elements 62, 51 of these differential devices are connected as shown to the master differential arm 28 so that unequal adjustments of the throttle levers or of the instructor's controls have their appropriate effect upon the banking and turning of the cockpit, and the instructor's adjustments may be counteracted by appropriate movements of the rudder bar 67 and wheel 45. Movements of the rudder bar and hand wheel from their central position cause unequal stresses in springs 71 and 55 respectively in cable circuits connected to the rudder bar and hand wheel control and to two trimmer devices 68, 69 and 52a, 53 which can be set to equalize the tensions in the springs in the new settings of the rudder bar and hand wheel. Each lever 10, 11 is associated with a pitch control arm 74, 75 as shown in Fig. 3. The levers 74, 75 control the readings of two tachometers 76, 77 through variable resistances 84, 85. They also control, jointly with the throttle levers 10, 11 through differential devices 98, 99, and variable resistances 106, 107 two boost gauges 78, 79. Resistances 88, 110 in series with the resistances 84, 106 and resistances 89, 111 in series with the resistances 85, 107 are varied by the connections 18, 19 operated by the instructor from outside the cockpit to simulate the effect of a "dying " motor. Mixture setting levers 136, 137 control signal lamps visible outside the cockpit to enable the instructor to observe whether appropriate settings have been made by the pupil.