What the heck is a floating piston? Well, a floating piston is literally a stroke of genius. Connect to pistons together with a single rod and you have yourself a floating piston. This type of engine is as efficient as most fuel cells. It produces electricity by moving a permanent magnet back and forth over coils surrounding the rod. The first engine was built by this man http://en.wikipedia.org/wiki/Ra%C3%BAl_Pateras_Pescara . It's been around for decades and we are just now unlocking its potential. This type of hybrid efficiency could be used in automobiles and I think could do very well in light hybrid aircraft.
