Definitely got to do TDC, specifically the "Fast 90" or similar tactic...
I can say with confidence that before I used Fast 90 I never made a single manual shot... just couldnt get it... but once I discovered that miracle, I dont think I've missed... maybe once or twice... I've begun varying on that tactic and doing wider and shorter angles, but the same principles apply... so far I've got about a 75% success rate at much more acute angles.
In any event, when dealing with convoys I take the nearest target, track it to get the speed (using the 3'15" rule) and course (just plotting obviously). Then I figure out the targets I need... Set up at 90 degrees to the course of the convoy, at a set distance from the nearest target you tracked, then all you need to do is figure out the range to the other ships and the periscope angle you are going to fire at... usually pick farthest to closest. Speed and course is the same for every other target. Figure the range and angle for each ship ahead of time, put the first in, wait for the ship to cross your sights, fire, change range and heading angle values that you predetermined earlier to the next target, wait til it crosses, and fire, repeat up to 4 times (or 6 if in XXI).
This tactic is very easy and very successful... in my best moments I've fired 4 torpedoes and hit 4 targets.
Adam
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