This is a DIY launcher built with Makeblock suits. We used two CNC motors to drive friction wheels, of which the speed can reach 120km/h theoretically. The machine is strong enough because of its metal framework. The maximum no-load speed of the friction wheels could be close to 10000RPM, so that please be careful in your progress of testing.

Glad to tell you that Makeblock is just about to sell this package ! And you don't need pick all the material one by one anymore! http://www.makeblock.cc/friction-wheel-launcher-p...