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Invented and patented by a twelve year old boy.
http://www.memsnet.org/news/1132507379-0/Square Wheel Car Propels Itself By Shifting Weight
Possible MEMS Locomotion
A new method of locomotion has recently been invented that may prove useful in many scales of operation. While the title suggests a very narrow topic, there are in fact many interesting variations that arose during the development of this patent pending device. The application of which include robots, micro machines, novelty toys, and others.
The first prototype consisted of a car with 4 square wheels, in the general configuration of a typical car, with all 4 wheels mechanically connected together so they must all turn in unison. Furthermore, the rotational orientation of the wheels are sequentially off-set from one wheel to the next by 22.5° (¼ of 90°), moving around the vehicle in a CW or CCW direction as viewed from above. [continued]
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