Reinventing the Wheel

An elongated torus made of a laterally flexible mesh houses an engine which keeps itself centered using two rotating cylinders, each of which hosts six counter-rotating gear spinners with fine-toothed cogs. The gear spinners generate propulsion by rotating the inside of the tube into the direction of travel, thereby continually driving the outer tube backward. Steering is achieved by rotating the two main cylinders around the axis defined by the length of the engine.
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