The design won't be much different than this http://www.redstoneprojects.com/trebuchetstore/catapult_2.jpg"
The main difference is that my group's catapult has to launch at different angles, so we're adding a mechanism to do that.
Ok, so for a summative project, my group has to build a catapult which must use elastic bands to propel an object. I have the energy, force, and maximum stretch distance of the elastic band. The values are 8 joules, 16 Newtons, and 0.5 meters. The catapult is not built yet, so I can't give any...