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Originally Posted by Jefferson
Pushing doesn't make the wheels leave the ground
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Horizontal pushing "transfers some of the weight" to the rear wheels, even if the front wheels do not leave the ground.
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ANY robot that has weight taken away will have less traction and lack pushing force.
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I believe the point being made was that with a chained drive, all motors on each side are still providing force... And that force will be distributed to the wheels with the greater traction (the rear wheels), once the wheels with the lesser traction (the front wheels) have reached their traction limit.