I'm currently working on a top-down tank game. The mechanics are really simplicity itself - I use 2 seperate inputs for the chassis and the turret, that way they can move independantly. Just make sure when the chassis moves or rotates, the turret makes the same move. There you go, tank mechanics 101

After a little bit of "window-dressing" I'l have some sceenshots up soon. I'm off this week so i'l have lots of time to work on it.
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http://tankzgame.blogspot.com