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Old 05-29-08, 10:31 PM   #18
seafarer
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Quote:
Originally Posted by Castout
Quote:
Originally Posted by seafarer
You can listen at surface in a Sargo or Salmon boat - the hydrophones are "chin" mounted (under the forefoot).
Are they the two mini balls pointing downwards ?

Actually it is a smart thinking to place the hydrophones under the keel so that the submarine would still be able to listen even when they are surfaced much like a destroyer hydrophones.
Yes, those are retractable hydrophones for supersonic sounds, but you can pick up subsonic sounds sometimes (see http://hnsa.org/doc/fleetsub/sonar/chap1.htm )

also - http://hnsa.org/doc/sonar/chap14.htm
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