Quote:
Originally Posted by Paulebaer1979
Today thatīs wrong. In a well trimmed sub with "all stop" you only can hear the crew. The hull doesnīt make noise because the pressure doesnīt change - if the sub donīt change its depth.
I guess it was so in the past, too. So we have a silly bug in our nice game.
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As I have read, it was a bit different in
WW2 They didn't have the vibration isolation and sound deadening technologies in use today. To hold depth at "all stop" you have to operate the pumps. Turn on the pumps and the escorts hear the noise. Turn off the pumps and the sub settles, as numerous small leaks let water in. And, as the sub settles, the hull compresses, increasing displacement, so you settle even more....
All this is modeled in Stiebler's "Slient Running" patch. Makes an interesting dilemma for the Kaleun!
BTW, escorts have passive hydrophones too, and they are of much longer range that active. They don't have to ping to detect you. Pinging, even today, is primarily for a targeting solution.