Quote:
Originally Posted by Hitchhiker 42
There isn't any scrub. The wheels are in the middle of the ball vertically, so if one wheel spins, it rotates around the other. And if both are spinning to go diagonally, the axis of rotation lines up so both wheels have no scrub. I'm not sure, though, how it would work out if it wasn't a 45 degree diagonal, but rather something like a 60 or 30 degree diagonal.
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There axis of rotation of the ball would not line up with the wheels when both are spinning though. Here is a quick sketch of where it would be in relation to the wheels:
https://docs.google.com/drawings/d/1...DOI4KIXro/edit