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Who was David and who was Goliath in your story?
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The sub-class first commissioned in 1971 was David...
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Why you did this? And what sonar? TA, hull or bow? And from what value?
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I modified the Passive Sonar Source Levels in DWEdit - i.e., how 'noisy' the boat is...
According to this (and a few other diagrams on the net), a 637 is comparable to an Akula 1.
http://gentleseas.blogspot.com.au/20...ine-noise.html