Helped my student make this catapult for a high school physics project. Used 2" scrap lumber, screws, 2 cup hooks, and a short bungee cord. Made a projectile seat out of card stock and hot glued it on. Also copied a protractor and taped it to the side for calibration. Throws a small bean bag about 10 meters (32.8 ft) at full force.
The Best of The Real Thing with the Coake Family ~ 2015 Edition