[Chris_Ely]

My team was going to prototype a belt shooter, but then we ran some calculations.
The Frisbee's linear is theoretically half of the belt or wheels tangential velocity. So, the larger the wheel, the larger the tangential velocity. The belt has the same linear speed the tangential speed of the pulley that it rides on. Most belt pulleys are small when compared to the wheels that most teams are using--around 2 inches in diameter verses 6-8 inches in diameter-- so in order for the belt shooter to move the Frisbee as fast as a larger wheeled shooter, it has to move faster. Moving faster increases the chance for slippage between the belt and the Frisbee.
If you had belt pulleys of a larger diameter, and a belt that has a high grip on the Frisbee, I seen no reason that a belt shooter would not perform the same, if not better, that a wheeled shooter.