Quote:
Originally Posted by hongher2005
But the thing I can't get is how to get 1 rubber band to turn it all and move it.
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On of the simplest ways to turn a wheel with a rubber band is to attach a spool wheel to the rolling wheels axle, wrap a strong thread around it, attach the other end of the thread to the rubber band (with a dowel or padding to assure that the thread doesn’t cut the band), stretch the band as far as possible, and attach it to a peg or hook on the car’s chassis.
The contest rules state “Transferring the energy of the rubber band to wheels via gears, fly wheels, etc., is encouraged.”. This is a strong hint. While a spool-on-axle transmission is very simple, it isn’t the most efficient possible scheme, especially for a fairly heavy car on a carpeted floor with an inconstant power supply (a rubber band). A more effective transmission could use an eccentric spool.
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