Here is our Frisbee shooter Prototype, its a linear shooter that uses two pneumatic wheels and a circular hopper. The shooter is able to shoot at slower more accurate rate or a high speed rate. But when shooting at the high speed rate (4 Frisbees in less than two seconds) we see a drop in accuracy due to the wheels/motors slowing down a little after each shot. This high speed rate will probably slow down by the competition time. Right now we are almost done with our final shooter based on this design just have to fix some loading issues.
http://www.youtube.com/watch?v=dxjovyrmU4A