This Four Balls solution.

[Vincentio]

Well first of all, samoo* is god.

Secondly, i don't understand ♥♥♥♥ about this solution, it looks like it defies the laws of physics:
http://fantasticcontraption.com/?designId=11125404

First it winds up once, all good. Then the powered wheel falls back, which means there's no tension anymore between the cart and the powered wheel, which should cause the cart to fall back but for some reason it doesn't. Why the gently caress doesn't it fall back?

[uuuiiiooop]

I'm pretty sure I see why it doesn't fall back down (not positive)

You see how the on the right of the box holding the balls in (the right wall of the basket thing) moves down as the whole thing is lifted up and to the right, to let the balls out? That means going the other way (basket falling back down when the tension on the wheel is released) would make the move left, but it can't because the leftmost ball has now fallen into the basket and all 4 balls together make no room for the on the right to turn left, so it gets the whole thing stuck. Not a very clear explantion but I hope you understand

[0wnyouu]

I'm pretty sure I see why it doesn't fall back down (not positive)

You see how the on the right of the box holding the balls in (the right wall of the basket thing) moves down as the whole thing is lifted up and to the right, to let the balls out? That means going the other way (basket falling back down when the tension on the wheel is released) would make the move left, but it can't because the leftmost ball has now fallen into the basket and all 4 balls together make no room for the on the right to turn left, so it gets the whole thing stuck. Not a very clear explantion but I hope you understand

Don't think so http://www.fantasticcontraption.com/?designId=11565047
I believe it is just momentum.

[uuuiiiooop]

I'm pretty sure I see why it doesn't fall back down (not positive)

You see how the on the right of the box holding the balls in (the right wall of the basket thing) moves down as the whole thing is lifted up and to the right, to let the balls out? That means going the other way (basket falling back down when the tension on the wheel is released) would make the move left, but it can't because the leftmost ball has now fallen into the basket and all 4 balls together make no room for the on the right to turn left, so it gets the whole thing stuck. Not a very clear explantion but I hope you understand

Don't think so http://www.fantasticcontraption.com/?designId=11565047
I believe it is just momentum.

[rianbay812...2]

the stick that the wheel is attached to pulls at first, then pushes.
The staying up part is prolly just momentum

[zhyrek]

This is why: http://www.fantasticcontraption.com/?designId=11575678

When the pink wheel part falls down, it pulls the parallelogram thing to the right for ust long enough for it to get in place. Newton's third law ftw

[Vincentio]

This is why: http://www.fantasticcontraption.com/?designId=11575678

When the pink wheel part falls down, it pulls the parallelogram thing to the right for ust long enough for it to get in place. Newton's third law ftw

Ah i see, makes sense now. He timed it pretty much perfectly aswell then, since the parallelogram doesn't fall down one little bit.