Patent GB-576290-A (GB)
Title: Improvements in aviation trainer
IPC: G09B9/24
Filed: 1944-02-29
Abstract: 576,290. Apparatus for training pilots. LINK AVIATION DEVICES, Inc. Feb. 29, 1944, No. 3769. Convention date, May 4, 1943. [Class 4] A ground trainer of the type comprising a fuselage mounted for universal tilting movement, is provided with an air-speed indicator and a recorder for tracing a simulated ground course, which are caused to respond to movements of a dummy throttle lever and variations in the fore-and-aft attitude of the fuselage, the apparatus being so arranged that changes in the reading of the air-speed indicator and in the-speed of the recorder are gradual, so as to correspond with analogous conditions in an aeroplane. The invention is shown applied to a trainer of the type described in Specifications 370,128and 481,375, associated with a recorder as described in Specifications 484,243 and 561,835. Movements of a dummy throttle lever 30 are communicated to a link 58 by members 36, 44, 48, as are the pitching movements of the fuselage about a pedestal 14, by members 102, 92, 50, the link 58 actuating a needle valve 82 in a bellows 74 through members 60, 68, 72. The linkage system includes a member 56 connected to dive and climb valves actuated in the manner described in Specification 481,375. The bellows 74 is connected at 86 to a suction pump, and by means of a pipe 112 to a second bellows 118 in an air-speed transmitter 114. A longitudinal member 142 is secured to the bellows 118, and is connected by a cord 148 to a pulley 150 which by means of a magnetic coupling 202 operates the input shaft of a " telegon " air-speed transmitter 208, connected by a cable 210 to a receiver 212 which actuates an air-speed indicator 215 in the trainer fuselage. The pulley 150 is also connected to a " teletorque " transmitter 160 connected by a cable 174 to a receiver in a wind-drift instrument 179 associated with the course recorder as described in Specification 561,835. Movements of the throttle lever 30 or pitching of the fuselage operate the needle valve 82, the consequent pressure variations in the bellows 74 being transmitted to the bellows 118, actuating the member 142 to vary the reading of the air-speed indicator 215 and the speed of the recorder. Pressure equalisation between the two bellows takes place gradually, thus avoiding sudden variations in the indicator reading and recorder speed. The transmitter 114 includes an indicated air-speed instrument 246 and a true air-speed indicator 260, both of which are under the instructor's control. Adjustment of the control member 246, which carries a pinion 236 meshing with the telegon transmitter 208, enables the instructor to modify the reading of the pupil's air-speed indicator 215, without affecting the speed of the course recorder, in order to demonstrate the effect of assumed altitude on indicated air speed. Similarly, adjustment of the true airspeed member 260 enables the effect of any assumed conditions of flight on the speed of the aircraft to be simulated. A pinion 250 integral with the control member 260 meshes with a second pinion 166 driving the teletorque transmitter 160, variation in the speed of the course recorder being accompanied by appropriate change in the pupil's air-speed indicator 215, by reason of the magnetic coupling 202 between the transmitters 160 and 208.