Where are you getting that 1/10th number from? The most thrust anyone was getting was 750mN at 2.5KW. At that efficiency you need to have something that produc

Where are you getting that 1/10th number from? The most thrust anyone was getting was 750mN at 2.5KW. At that efficiency you need to have something that produces >32.7W/g just to hold itself up. That's rocket engine territory: http://en.wikipedia.org/wiki/Power-to-weight_ratio http://en.wikipedia.org/wiki/Power-to-weight_ratio We barely have supercapacitors that'll deliver that sort of power output. For a few seconds, maybe. Not accounting for the mass of the device itself. Hopefully if this ever turns out to be something the efficiency will improve. But I'm not holding my breath. (Number taken from here: https://news.ycombinator.com/item?id=9474610 https://news.ycombinator.com/item?id=9474610 )