Ok, and I have another question thats slightly unrelated. I made an aircraft and when I spawn it ingame it starts rolling away forward by itself. I tried editing the massCenter values and editing the placement of the model itself using ms3d but it still moves away, and when the aircraft is flying and you roll/bank it jerks up and down in a wierd way.
I managed to center the model but now when I spawn it the wheels spawn in the ground. Why is this happening?