Andrew put this together a couple weeks back... sorry we didn't get it up here sooner
We would have a two-wheeled prototype to show you guys as well, but I failed miserably at it... sorry to disappoint
Here are a couple of videos... one is of a good run and one is of a bad one.
http://media.putfile.com/Ball-launcher = BAD
http://media.putfile.com/Ball-launcher-2 = GOOD
what do ya think?