I have recently decided to build a Trebuchet. What is a Trebuchet you ask. It is a medevil seige engine, similar to a catapult. The difference between it and the catapult is the Trebuchet uses gravity on a counterweight to propel the projectile. I have attained a Trebuchet simulator from
http://www.trebuchet.com and I will start engineering a tabletop model in the near future. Pics will come once a prototype is built.
The end goal is to enter in a pumpkin chunking competition, and see how far it can throw a 6 pound pumpkin.
I got the idea from watching a video put together by LIARS a rocket club in Long Island.
More to come.