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Originally Posted by caspofungin
british ww2 asdics used pings in the range 14-20Hz -- well w/in the hearing range of humans.
re constant pinging -- that's true, in ww2 escort vessels constantly had the asdic operating. unfortunately, that's not implemented in sh3 (although i seem to recall it in silent service 2).
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It's been my understanding that the lead escort would race forward and cut engines back, then zig-zag with active sonar while the rest of the convoy caught up. The side escorts were responsible for the quartering attacks, and would do ovals -- racing forward, then cutting their engines and circling until the convoy was abeam, then racing foward again.
I've also heard that some WW2 sonar was ultrasonic. Whether it was the Yanks, the Jerries, the Brits, or the Japs, I don't know. It may have been late 1940's sonar that went ultrasonic for awhile. You get better "resolution" with higher frequencies, but the power efficiency drops as with any transducer/speaker (basic induction).