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Old 06-09-10, 06:39 PM   #3
treblesum81
Frogman
 
Join Date: Apr 2008
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Quote:
Originally Posted by Ducimus View Post
Passive only. Though i also reduced how sensitive passive is as well.

I did this because i thought the AI's hydrophones were too sensitive above the layer. Which was a side of tweaking their sensitivy up to such a rate as so you can be heard within reason below the layer. By lowering the thermal layer effect on hydrophones, it allowed me to reduce the hydrophone sensitivty so their not super sensitve above the layer, and not completely deaf when your below it.

edit:
BTW, your speed, wind speed, range to destroyer, silent running, and below layer or not all play a part.

In sum, always have silent running on when you can, and the calmer the weather, the slower you go. Rough seas you can open the throttle up a bit.
I was at a dead stop, in silent running, about 1000-2000 yards from the destroyer(s), and in light to moderate seas. Basically, I was a hole in the water ascending by air pressure only and as soon as the top of my periscope crossed the thermal layer (verified by raising the scope and ascending which caused detection at a deeper depth) I was immediately detected. It almost seems like the net result of the changes, at least under these conditions, is to create a plane in the water where you become instantly visible if any part of your sub crosses it on the way up. More concerning though is the fact that DD's seem to be able to target me with active sonar well below the thermal layer.. After detection, I went as deep as 300ft on silent running at only 1kt and they were able to consistently place depth charges on my deck or at least within 50ft of my sub. I wonder if the reduced thermal layer effect had improved the passive response to active sonar?
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