Maybe it works only because I'm still in the happy times (dec. 1940), but usually I do like this:
1. Get right ahead of the convoy with reciprocal course
2. Place myself just under periscope depth and proceeding at 2 kts or less
3. Put the boat between the predicted course of the two central columns of the convoy (usually the most valuable targets are there)
4. Turn the boat by 90 deg, so her bow is heading towards the projected course of the column where the front escort of the convoy is
5. Stop the boat and maintain a depth of 14 mt -- absolute silent running
6. Let the escort pass
7. When you are in the midst of the convoy, fire a salvo of two against the best target of the column in front and another one at the best of the column behind you, the fastest the better
8. Maneuver so you can fire another two torps to another target in the front column
(7 & 8 must take no more than 180 sec.)
9. Crash dive; go silent at 50 mt.
10. Make a hard turn and go to 150+ mt.
11. Disengage -- the escorts will get to guess your position, but you will be already too deep for them to locate you precisely when they arrive.
Usually I can sink three large ships (cargo, merchants or tankers) and run away unscathed.
I'm playing GWX 1.03 at 90% realism (external views just for the fun of seeing ships sink, not to gather info).
Gute Jagd
Buhring
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