Ops i hit the return button to early.
I also wanted to say that this system was used at the 2x4 Penguin AATV and the 6x6 Scat. The Penguin had a second aluminium wheel with padles on the outside of the rim (looked like a mill wheel) and the Scat had 4 big padles on the rim. Ask Amphiman, as far as i know he should have bought a Scat with this paddles.