New NASA Emdrive paper shows force of 1.2 millinewtons per kilowatt in a
Vacuum and a low thrust pendulum and tests were at 40, 60 and 80 watts:

"The newest NASA emdrive paper concludes a force generation of 1.2mn/kw after errors
measurement is accounted for.

A low thrust pendulum at the NASA Johnson space center was used."

See:

http://www.nextbigfuture.com/2016/11...-force-of.html