TWRoO on 25 August 2008
Here are 2 for U-turn.
http://FantasticContraption.com/?designId=823136
http://FantasticContraption.com/?designId=868144
As well as a "down under" with a double jointed catapult and no need for anything attached to the pink ball.
http://FantasticContraption.com/?designId=870198