[Cory]

Originally Posted by bmarick

i meant that you have to make sure the wieght is balance because otherwise you could end up only have the four wheels touching the ground. i gess but that just makes the robot seem jerky to me because the front wheel will loose and gain tration on weather you have the robot acelerating or deacelrating.

The entire point of dropping the center wheel is that you only have 4 wheels touching the ground at any point in time--this cuts your wheelbase length in half. When you rock, you still have 4 powered wheels in contact with the ground at any point in time. This is a good thing.