Here’s an ‘old-school’ friction toy that I have recently discovered. I reckon most of you, being a crafty lot, must have some old cotton reels knocking about so why not give it a bash?
All you need is an old cotton reel, a slice of candle, a couple of matchsticks and some elastic bands. Check out www.cottonreeltank.org for a lovely little illustration explaining how to construct them.
There are all sorts of tweaks you can make to improve your tank. For example, if you cut notches in the rims of the cotton wheel you can get it to climb up obstacles. Sorted!