[Spaceships] Real Life Non-Super Science Reactionless Engines

[Agemegos]

This FAQ by the inventor is interesting.

Note however, because the EmDrive obeys the law of conservation of energy, this thrust/power ratio rapidly decreases if the EmDrive is used to accelerate the vehicle along the thrust vector. (See Equation 16 of the theory paper). Whilst the EmDrive can provide lift to counter gravity, (and is therefore not losing kinetic energy), auxiliary propulsion is required to provide the kinetic energy to accelerate the vehicle.

Emphasis added

It'll bear a static load, but not accelerate a vehicle. So it's a sort of suspension, not a drive.

Still amazing, though. 30 Newtons per Watt is astounding.