One of the ten inventors on a new Searete LLC-filed patent for a new type of engine combining attributes of traditional internal combustion and power generators? None other than Microsoft's Bill Gates ...

Sandia National Laboratory led by Sandia researcher Peter Van Blarigan that has been testing physical components of free-piston engines which could be 50% efficient. This is about twice as good as ...

Everyone generally knows about piston and rotary engines, with many a flamewar having been waged over the pros and cons of each design. The “correct” answer is thus to combine both into a single ...