Here team 842 is adjusting all the things needed to do a perfect hurdle.
The robot,Virginia's DREAM, lowers her lifting arm and lets the trackball press the pressure sensor locking the launcher and pressurizing 5 inches of the 2 inch diam cylinders. After 3 seconds the lock releases and the launcher.....launches.
http://www.youtube.com/watch?v=DEKIe8_agwk