Ok, well I tried to transfer the code from the block level to the tank project, and freaked out when it didn't work. Then I realized that it was due to the high gravity I was using. So now I have to work out mass, gravity, and force to get everything correct. What do you usually use for gravity? I want to try to keep the mass of every object true to it's real life mass using metric (kg, g, mg, etc).

This kind of exposes an amateurish mistake I've made: not planning ahead. So now I need to take measurements of my terrain, get everything scaled correctly down to the milimeter, and work out a usable in-game scale. I was wondering the other day why it took far more velocity than it should have to get bullets firing at a reasonable trajectory, in reference to what I've seen such rounds do in other games and real life. Gravity was WAY too high, and though my masses were correct, it took more initial force to make bullets fly properly.

The only thing I don't get now is what value gravity should actually be. I need it to properly simulate earth's gravity. Then I can correct any problems with mass, and make my velocities for bullets, and even force/torque on the tank correct.

EDIT: No, that post was a main.c for the test I was doing with plain old blocks. If you'd like to see the whole code, or just the whole tanks action, I can post or give it to you.