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Originally Posted by ridgewayranger
Hi There,
Decoys used by U Boats did not make a noise. They were known to us as SBDs or submarine bubble decoys. A chemical reacted with seawater to produce a large cloud of tiny bubbles wheich remained static for a while.
It returned echos to the sonar which sometimes deceived the operators but a good one could usually distinguish it by the woolly sound of the echo and the fact that it was stationary.
Incidently, escorts used to tow a noisemaker called Foxer to decoy the acoustic torpedo developed by the Germans.
RR.
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heh cool, nice bit of info ty
