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 ...

One of the major driving forces behind the pursuit of green energy sources in the last few decades has been the relative scarcity of oil around the world. Because it is very gradually becoming more ...

The global race to develop zero-emission vehicles often gives rise to misleading and false claims. One recent example claims that Toyota, the world’s largest car manufacturer, has unveiled a ...

Astron aerospace has shown a partial prototype of a new rotary combustion engine it claims runs at an extraordinary 60% thermal efficiency, burning totally clean with zero NOx emissions and nothing ...

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 ...

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 ...

Variable cycle engine design embodies a transformative approach in aero‐propulsion, enabling engines to adapt their thermodynamic cycle to meet diverse operational demands, from fuel efficiency to ...