tan簧tan射器

This is an XPult Educational Catapult that can be used by teache, college professo or other traine for Physics lesso, Design of Experiments lesso and more. I modified the XPult to retrofit it with springs for use in my college Dynamics classes. The XPult is available from www.xpult.com, and the spring, space, and other hardware is commonly available at your local hardware store.