[JesseK]

Dave's math assumes several underlying principles, and the debate parallels that of traction vs wheel width on carpet. The 'ideal case' can always be argued against in one way or another. Unless you're sending something into space or 7 miles under the sea, the 'worst case' can always be engineered around with protections or tolerances such that the worst case becomes negligible.

In Dave's scenario, extra bumper support would spread the energy of the impact across more surface area, therefore increasing local structure integrity. Those of us who do cantilevered wheels simply need to do the same. What Dave doesn't tell you is that the impact energy has gone through the bumpers it then enters the 'equal and opposite' clause of Newton's laws. Due to the full extent of <R08>, I believe there will be many a pinball robot...now that will be fun to watch....