The first thing we tried to do with the sucker was to get it to climb a vertical
wall. After hunting around and failing to find a suitably smooth wall, we
decided to build our own... used six tongue and groove floor boards, held together with
a few wood beams and painted with Sandtex paint to improve traction.
KHz didn't have quite enough traction to be able to climb vertically up the
wall - the disadvantage of two-wheel drive. You can see the black lines near the
base of the wall in the video, from the wheelspin.