[skyomish]

This was changed in 4.10.1 or 4.11.1 patch.
In the read me that came with them it gives all the info you are looking for.

LT F5W (Italian Whitehead)
100m, 300Km/h

LT F5B
40m, 250Km/h

Mk13, Mk13a
30m, 205 km/h

Mk13 late
180m, 400 km/h
(this torpedo had a much wider range of drop than the early one)

Type91
30m, 240 Km/h

Type91 late
60m, 330 km/h
(this torpedo had a much wider range of drop than the early one)

45-17
30m, 205 km/h