Torpedo pistol/homing properties

Like in the topic, I'm looking for a way to change the way the German acoustic torpedoes behave - make them move smoothly, along one curve all the way to the noise they hear instead of zigzagging. Also mess with the sensitivity of its homing gear or at least understand the factors governing it - just the object's speed or the engines' loudness?

I've been looking closely at the torpedo-series files through Sh3D (sim, zon, etc), but I clouldn't find anything. So here's my question - where do I find the files governing the properties mentioned above?