Walker's Over-Engineered Torsion Catapult 2.0 (Wide-Body)

This is the wide-body version of my modified SEEJ torsion catapult. I think it's much better!

I'll leave the skinny one available here if you would rather have that one. http://www.thingiverse.com/thing:1923579

The width matches the length of an average rubber band much more closely, so you don't waste twists taking up slack before you can build tension.

I also made a second arm to choose from that fits marbles, and included some balls that fit really well. There's a caddy that will still mount to the side of the engine that has a slight angle, so balls will roll to the back.

The atlas was further modified to launch at a 60 degree angle, giving it some more time to deliver some kinetic energy before it hits and releases. To compensate, I extended my height bar even further, so you just have to tilt the engine to get the lower angles.

I widened the 'foramen' even more so that more bands could be threaded.
About 3 turns of each key got me a 10 foot shot! It's certainly capable of much more!

The compass origin was moved again so that it sits right below the release point. This should give further accuracy.

This project was used as a visual aid along with a few others for my sixth grade class, who built their own scale projectile motion machines with many of the same features.