The concept is purely kinetic (spring), it allows the wheels to spin at different and irregular speeds but most importantly to run for a long time (+30minutes). After you rewind the mechanism the wheels start to spin in opposite direction. As soon as the gravity makes the front wheel reverse its spinning direction and pushes some pawls in the system, the 2 wheels are pushed and start to spin again. This is happening until the spring is fully unwinded. If properly optimised and by reducing the friction, it is possible to get a runtime of more than an hour!
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