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Are you guys sure? How fast do you have to be going to get from 120m to PD in time to line up some targets?
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At slow speed(1-2 knots) it seems to take a loooong(and very tense
) time. I've sucessfully tried this once at slow speed(was found by the pesky escorts on a couple of earlier tries and had to abort the attacks
) and I was near the tail end of the convoy by the time I got to PD and had to do some very quick shots for some so-so sucess.
Not too long ago, while sailing out to my patrol area, I did some tests. I dove to 40m and timed how long it would take to get to PD at various speed settings. I'm at work and don't have the times handy, but it seemed that Ahead 1/3 speed was a huge difference from Ahead Slow time wise when compared to the increase in speed and noise. Ahead 1/3 seems to be a good compromise between stealth and getting to PD rapidly. I'll have to do some tests from deeper depths.
I've had one opportunity to try this tactic again at Ahead 1/3 and it seemed to work pretty well. I got up to PD pretty quickly and undetected, was within the convoy near the front, and was able to choose my targets a little better.
It is still a nerve wracking experience though, especially if you pop your scope up and see that you're in line with one of the columns of ship and some big freighter is bearing down on you!