Hi Leitender,
I use two settings for the TII and TIII torpedo in torpedo.sim:
TII(cold, speed setting 1): 28kn/3000m
TII(heated, speed setting 2): 30kn/5000m
TIII(cold, speed setting 1): 28kn/4500m
TIII(heated, speed setting 2): 30kn/7500m
From now on I will only switch to the heated speed if I have been in contact for more than four hours.
Anyway, back to topic... (sorry, the_frog

)
Cheers, LGN1