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Originally Posted by Kevin Sevcik
This is, in fact, just a very rough approximation, as the width of your wheelbase affects how much skidding happens and what the actual torque arm for the friction is and what the torque arms of the wheel turning forces are, etc. etc. etc. I'm assuming all that is covered in much more detail in those whitepapers kramarczyk linked.
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Yup, adds up the contribution that each wheel adds to the turning moment (M=f*d) less the resistance of each wheel to the turning moment.
Summary
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Ever wonder why your four-wheel-drive system won't turn? You'll never need to wonder again. Drive Train Basics gives a full explanation, complete with mathematical equations, to allow you to design a drive train that will turn without a problem.
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