There is a bug in the TDC that causes lead angles not to be updated when you switch between selected tubes with different torpedo types set to different speeds, i.e. T1 and T2. So it is best to set all of them to the common speed, lest you mess up your aiming. Whatever reality was like , this is more important to avoid in my opinion.
p.s. Scuttlebutt (or what is the german equivalent of navy gossip?) says it isn't so easy to modify the T1 torpedo speed controlling hardware. Atleast not on the fly. So this seems a reasonable realism limitation to do.
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