One of the many events coming up at Maker Faire Austin is the
King of Fling competition. This alone sounds like it'll be worth the drive and the price of admission.
"""The English Battle (The Siege of Stirling Castle)
The goal of the contest is to hit targets. The targets battle will be placed at intervals as shown in the Field Set Up Diagram. During the actual contest, each contestant fires 6 projectiles while the judges observe. At the judge's signal, your team's time on the firing line will begin. Then, firing will commence and you may shoot as many as 6 projectiles. All projectiles must be hurled within a total of 4 minutes. Teams experiencing mechanical problems will be allowed reasonable time to correct problems and allowed to shoot again after all other teams have completed their hurls.
More than one contestant may be on the firing clock simultaneously.
What will you shoot? Two types of projectiles are allowed: Water balloons or dead horses. (Note: Dead horses are more historically authentic catapult projectiles, but water balloons are somewhat easier to procure.) Participants must supply their own water balloons and/or horses. Safety glasses are required. """