Sound-indicator for indicating hits scored on flying targets with weapons, especially aircraft weapons

摘要

652,032. Target towing arrangements. SVENSKA AEROPLAN AKTIEBOLAGET. Aug. 13, 1946, No. 24027. Convention date, Aug. 13, 1945. [Class 4] [Also in Groups X and XXXVIII] Indicating - equipment associated with a flying target and adapted to indicate the result of firing during anti-aricraft practice comprises indicating means controlled by a sound-responsive device arranged in or upon the flying target or towed near it. In the embodiment shown a stream-lined container 1, Fig. 1, is towed behind an aeroplane and in turn tows a sleeve or other target. When a shot passes near the target it produces a pressurewave which enters slots 12 and impinges on a corrugated diaphragm 11. The air in a funnelshaped chamber 2 is therefore compressed and lifts a spring-loaded valve 5 from an electrical contact 7. In the towing aircraft is located a thyratron 18, Fig. 4, whose negative grid-bias is supplied over a conductor 22 in the tow-rope, contact 7, valve 5, and return conductor 23 in the tow-rope. When, therefore, the valve 5 lifts in response to a nearby shot, the negative bias is removed from the thyratron 18 which fires, energizing an anode relay 26a. A lamp 28 is lighted and a counting device 29 operated over contacts 26c and a sluggish relay 27a is energized over 26b. When relay 27a operates contacts 27b quench the thyratron 18 and release relay 26a. The lamp 28 remains energized at 27c, until, as a result of contacts 26b now being open, sluggish relay 27a releases and the circuit is restored to normal. The lamp 28 may be mounted on the container 1 or on the target, and lighted by means of further conductors in the tow-rope. The impulse received from a shot may be utilized to send out a radio signal or a smoke signal. The zone in which a shot is effective to raise the valve 5 may be altered by adjusting its spring loading, the rigidity of membrane 11 or the size of the slots 12.