[Rick Wagner]

We have a successful prototype using two two-inch diameter, three inch stroke cylinders on a lever catapult. The cylinders are attached three inches from the catapult lever pivot, and the ball is placed 20 inches from the pivot. The catapult moves from horizontal through 45 degrees. We have a reservoir downstream from the 60 psi regulator and a reservoir upstream from the regulator at 120 psi. Each cylinder has its own solenoid. The tension side of the cylinder is open. The ball goes into the high goal reliably.