the spinnin' and pooin' thing was a reference to the picture you posted of the mule deer on the ice... i was at work when i read it, and i laughed out loud... i think it was sapienza that made the comment...

The basic physics of this thing is pretty wierd. It seems to me that the only way this thing could possibly move is if it's basically a big roller bearing and the engine pushes the outer race relative to the inner (where you sit). The only thing keeping the rider from rotating is the inertia of himself, the engine, and the other mechanical bits -- it's like a big gerbil wheel that's not attached to anything!

Remember american gladiators? Same thing happens when you try to stop in one of these.

http://www.sandysowell.com/images/Human_Spheres.jpg

i gotta get me one of those.....