I tried again last night, after a massive reading of all the "sweet spots" threads.
I was in Gibraltar, there was a T2 and a T3 there. I guess they are both empty cargos.
For the T3, I fired one shot at depth 11.7m, trigger M, aimed at the front sub-structure, and another depth 3m, trigger I, aimed at the engine room. This T3 sunk instantly.
For the T2, one shot depth 10.5m trigger M aimed at the front sub-structure did the job, the T2 broke in half.
I loaded my game many times for the T3, trying to sink it with one shot, no success. It was on fire, and eventually tilt starboard/stern, but still floating after an hour.
So maybe the best I can do for an empty T3 is two torps, and for T2 is one?
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