Otokichi Posted May 28, 2018 Report Share Posted May 28, 2018 "Techmoan" is back with a pricey "heat difference" engine kit. This up-and-down-piston-action engine operates via the difference in temperature between one surface and the other. It even works under bright sunlight! If the conditions are right, setting it in the palm of your (warm/hot) hand will start a "mechanical magic" show.;) Link to comment Share on other sites More sharing options...
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