Actually a photonic drive takes only 299.792458 MW to get a newton of thrust. You're units are off, the thrust per watt is equal to 1 / c which would come out t

Actually a photonic drive takes only 299.792458 MW to get a newton of thrust. You're units are off, the thrust per watt is equal to 1 / c which would come out to 3.3356 nanonewtons of force per watt. As for the accuracy of the 750 millinewton figure, that's the only one I've seen for the Chinese results but again, that has to be an error, even if the EmDrive did pan out in the end that's just an unbelievably high amount of thrust. I would assume it's supposed to be micronewtons and that was lost in translation.