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This noise decoyed the acoustic torpedoes away from the rear of the ship into a circling pattern around the noise maker (which was too small to strike) until the torpedo ran out of fuel. The noisy Foxer had the disadvantage that it also prevented the ship's own ASDIC from detecting any other U-boat nearby that could approach the convoy. [6]
It replaced the Foxer noisemaker. It was more effective than the Foxer, producing a sound similar to a ship's propeller, rather than wideband noise.
Foxer, a British towed decoy to decoy acoustic torpedoes away from surface ships. Also used by the US as FXR and the Canadians as CAT. Creates cavitation noises using water flow and metal banging noises (good-enough passive signature for the time). T-Mk 6 Fanfare. Towed, creates electrically-generated propeller noise (passive signature).
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In fact, only six merchant ships and three escort vessels, a destroyer, a frigate and a corvette, were sunk. However, despite some initial success, in particular sinking destroyers and corvettes, the Zaunkönigs effectiveness was quickly nullified by the introduction of a noise making decoy known as Foxer.