[skwasjer]

I may be wrong, and I'm no expert on this matter either, but I remember reading torpedoes carried compounds of different materials, torpex being one, but also aluminum oxide or something, and some other ingredients.

Different mixes gave different explosive power, and less weight did not necessarily mean less explosive power. Some compounds also worked better when used with magnetic fuses, below the ship.

Anyway, I just speak from what I remember I read, so don't slap me if I talk out of my ass...