|This robot vehicle layout has
the two drive wheels located in the center of each side, with
the weight balanced so that almost 100% of the weight of the
robot is on the drive wheels. This provides good traction and
very good maneuverability.
There is a
small balance/drag wheel in both the front and the back of the
robot for the extra weight of the robot to balance on, although
only one will balance wheel will touch the ground at a time if
the surface is flat and smooth. As the robot's weight shifts
during driving, the balance can shift back and forth from the
front to the rear balance wheel, but almost all of the robot
weight remains over the drive wheels for good traction and
You can build onto this vehicle platform to
make larger robots that can benefit from this layout, such as
the Gun Sentry Bot.
For a faster (geared up) version of this wheel
layout, check out the Sprinter.