Quote:
Originally Posted by first_newbie
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This referenced the "rocking" motion of a drop center drive chassis in the pitch axis. In drop center, there are three (or more) pair of wheels, and the pair(s) in the center are positioned a bit lower (typically 1/8") below the line connecting the front and rear axles. This drop allows the robot to have the advantages of a short wheelbase for purposes of being able to turn, and those of a long wheelbase for purposes of not falling over forward or backwards. The cost is a bit of rocking motion as the robot shifts from one axle to another. For some games, this is of little or no consequence, but for others where the robot may be very tall, have a long arm, or be aiming at a goal with a tight vertical tolerance, the amplification of that 1/8" can be a problem. For more detail on why drop-center, see
this classic white paper.