I just started this today so I don't have a lot done yet, but I wanted to thank PixelRebirth for the catapult example .cap that he posted a few weeks ago.
I wasn't sure what I was doing wrong with "hinge" but after seeing your .cap I was able to fix the problem. Thanks!
"Spacebar" (hold and release to launch)
After the projectile has stopped moving press any key to jump back to the catapult.
"Left Mouse" (creates new projectile)
I'm just using placeholders for now until I get more of the engine finished, but if you've ever played "Kitten Cannon" then this should be familiar. The goal of the game is to get your projectile to go as far as it can.
I only have trampolines added so far but there will be several other objects that either help or hinder your efforts to get the best distance. These objects will be randomly generated (once I've gotten that far), so every time you launch it will be a bit different.
(p.s. you can launch the projectile in the air a little bit and then hit it with the catapult, almost like hitting a baseball with a bat... sometimes it gets better distance than just launching far, sometimes not)