I only use impact. Generaly 3 torpedoes for the big stuff. 1 torpedo for the small stuff. 2 torpedoes for a little tanker.
It may sound excessive but, even with everything hitting target, I'm still finding ships that simply refuse to sink.
Even customized a 3 torpedo spread on a T2 Tanker.
Opened the spread up to 5 degrees.
All 3 hit. Nose, Tail, and Center.
It was hours before she finaly fell out of the convoy, and required a final stern torpedo to finish the job.
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