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Harry's Windmill is a thought experiment in special relativity, aimed at being a method of allowing an object of mass to reach the speed of light. Devised by Australian physicist John Yrneh in 2014, it has since been adapted by various other physicists in efforts to create more easily understood examples. Similar Gedanken-Experiments have been noted prior to 2014, however Harry's Windmill is by far the most prominent.

The scenario presents a hypothetical windmill, put on its side, with the blades facing upwards. The windmill is proposed to be of a set radius, and period, and is powered by a motor, with torque that is continually scalable. The blades of the windmill are to be made of an infrangible material, and able to extend to another set radius.