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An oldie but goodie, cotton reel tanks are great fun. Add your own tweaks and race them!
Erm... what's in the picture: - a cotton reel - a rubber band - a pencil - a match plus sellotape, scissors etc (For advanced models you can ...
Thread the rubber band through the cotton reel. If the rubber band is much more than the length of the cotton reel, shorten it by tying a knot ...
Break the matchstick in half. Put one end of the rubber band over one matchstick half. Sellotape the rubber band and the piece of matchstick securely to the ...
At the other end of the reel, stick the pencil through the rubber band. It should be not too tight, not too loose (experiment!).
Wind up the tank by winding the pencil with your finger
Let the tank go and it should run across your desk. You want to minimise friction between pencil and reel. You might need to add a spacer like ...
For the pro model, use a section of candle as the spacer/washer, and wrap the 'wheels' in more rubber bands. Use your imagination: how about a soap washer? ...
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