I used to be a TI fan.
I never had any problem with my torps getting spotted before impact.
However, recently I have switched to TIIs. The only reason being that, unlike
with TIs, the destroyers don't always head straight for you after your torps
impact.
I still keep TIs in my aft tubes because most boats didn't have the heating
equipment needed to launch battery powered torps from the aft tubes.
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