Regarding torpedo calculations, I discovered that SH3 gave me a great opportunity to dust off my slide rule (I went to a school where electronic calculators were verboten, but slide rules, log tables, abaci, etc. were allowed because you have to think while you use them). If you're able to get hold of one, it's great for calculating, for example, target speed if you know that when you're on a collision course (target at constant bearing, closing range),
own speed target speed
----------- = -------------
sin AOB sin bearing
so you just line up AOB on one scale (S) over own speed on another (D), move the cursor over to the target bearing on the S scale, and read off the target speed on D (for a calculation such as this, using the S scale for the angles means you're actually working with the sin of those numbers, no need to calculate them). It's also helpful for working out range, simply moving the slide to keep track of and project range data, and often quicker than using a calculator for this kind of thing ... unless you've got a calculator that you can simply set up with various programmes so that you just enter the numbers, but then that wouldn't be as immersive, would it?
Haven't played in quite a while, but this thread is prompting me to fire up the game again ...
S!
Maus