content: I've seen experimental data that shows the efficiency of ionic wind and it's pretty damned good. One of the most efficient methods of converting electricity to kinetic energy.  The main issues were the wind is kind of slow so your not moving fast (slow but efficient), the engine was the whole wing.   However there was a lot of work to deal with other issues such as ozone created, and how long the engine would last. https://www.nextbigfuture.com/2013/04/mit-experiments-show-ionic-thrust.html