Pneumatic K'nex Crane

This wasn't actually meant to be a crane, I was supposed to be creating a robotic arm like on the ISS, but it worked so well, I wanted to share anyway.

Materials

K'nex

Syringes and tubing

A small tub

Pipecleaners

Bean bags

Lego

Instructions

Build a K'nex crane like in the picture above, the arm just need to be one long section. We used a hairband to attach one syringe to the crane and pipe cleaners to hang a small pot.

Attach the syringes as shown. When connecting the syringes up you need to make sure that one is fully extended as the other is compressed.

Challenge

Find a way to stabilise the crane so it doesn't fall over when you add weight.