To add my 5 cents...
Here is a part of the original TDC Technical Manual (1MB). It may explain some things...
http://rapidshare.com/files/23253298/Theory_section.pdf.html
Also, on our website
www.usscod.org you can find the schematic of the TDC.
Also have a look at this one. It is a document (2MB) on which I'm working. It explains a bit about the real life Torpedo Fire Control.
As you can read there are still some open issues, some of which will be solved soon.
http://rapidshare.com/files/23255085/Torpedo_Firing_Controls.pdf.html
Haven't been playing the game that much yet (first had to find a budget for a new video card) but I will follow the forum.
Any questions?
groetjes,