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Yeah, isn't slip equivalent to inefficiency which would be 1 - (Useful Work/Total Work) which as it's a quotient is the same as 1 - (Useful Tractor Velocity/Total Wheel Velocity). Also, useful tractor velocity is the total speed in the positive direction minus the effects of towing, wind etc. Total wheel velocity at the edge is in fact (Pi * Radius * 2)/(Time for one complete rotation).
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