I've been half-heartedly working on an EM drive to add to my SpaceOpera thing. The current version doesn't generate any thrust, as (quite rightly) KSP doesn't do reaction without reaction mass. Or, the ModuleEnginesFX certainly doesn't as it needs thrust and ISP, so division by zero kills that.
But using the standard work around of creating a fake resource in an electrically powered generator, then using that for reaction mass is essentially rounding to "not working". (determined by being able to time warp while running the engine) I was hoping to get something as genuinely useless as the numbers coming out of the Eagleworks papers as a demonstration of how low the numbers are.
So, I was hoping someone knew if/what the minimum values would be for thrust/acceleration before they get rounded to zero by the game. Then I can just scale the size and power consumption until I hit the minimum.