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Re: Are six wheels better than four?
Driven (motor is powering the wheel) wheels will provide forward force.
Undriven (not powered by motor) wheels will distribute the weight more.
Traction depends on pounds per square inch of wheel that is in contact with the ground.
For example: you have 4 wheels, one in each corner. Robot = 120lb. Assuming that the robot is perfectly balanced, each wheel is carrying 30lb.
Example 2: 6 wheels, three on each side (left/right) with a 120lb robot gives 20lb per wheel.
More drive wheels still decrease weight/area ratio, but make up for it (possibly) with the added power.
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