That's kind of the point. IF the EMDrive works by pushing on a medium it doesn't break conservation of momentum.Sky Captain wrote:If EMDrive pushes against some kind of medium to generate thrust why would it break down physics any more than pretty much any other vehicle that's not pure rocket? Cars, airplanes and ships don't become perpetual motion machines after reaching certain speed just because they all use existing medium to push against. You could put maglev train in vacuum tunnel with no drag and no matter how fast it would go there would be no way to get out more energy than put in. Why EMDrive would be any different?
But it DOES create problems by implicitly creating a privileged frame of reference.