In the early 1970s, Spanish inventor Arturo Estévez Varela introduced a pioneering engine powered by water — a concept that held the potential to revolutionize automotive technology. Despite its ...

CASPER, Wyo. — The hot water goes in. The piston goes up. Oil comes up the well. The cold water goes in. The piston goes down. Oil goes out the pipe. Hot water, piston up. Cold water, piston down. Up ...

A furnace heats the base of one boiler-cylinder to 900° F. (688° above water’s boiling point). The superheated water expands (but cannot change to steam because it is too closely confined) and pushes ...

The global race to develop zero-emission vehicles is often the subject of misleading claims online. In the latest case, the world's top-selling carmaker Toyota has been credited with developing a ...

Air engines are a common occurrence here on Hackaday. They’re relatively novel and reasonably easy to 3D print without requiring any fluids or supporting machinery. For example, [Tom Stanton] took a ...