newscientist.com/data/images/ns/av/shawyertheory.pdf clearly states that the thrust (constant power input) varies with the velocity of the spacecraft. Which brings us back to "what velocity?" Thrust drops off as the craft continues to accelerate? That's absurd. Turn off the engine for a second and re-start with a re-set "zero point".
This is confirmed in the final paragraph of emdrive.com/faq.html 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.
Energy is required only to accelerate, but not to provide lift when "hovering"
Isaiah Foster
Addenda: Not sure if final paragraph meant "accelerate horizontally" or "accelerate vertically". The latter is even worse. The Emdrive can counter gravity so long as it's not accelerating. But give it a one-time shove upwards and it should continue to rise indefinitely (gaining potential energy) without any increased power demand because the velocity is constant.
Nathaniel Morris
the final paragraph is referring to moving a car on terrestrial earth, if that matters.
Hudson Morales
If this works as advertised, could we then have hovering Command Carriers like in Deserts of Kharak?
Jose Stewart
a theory IS explanation
Henry Davis
Shawyer's explanation for how the EM Drive might work provides for constant thrust, which means the EM Drive could be used as an over-unity device.
Oliver Brooks
"Car" meaning something like what Luke Skywalker drove in the 1st (in order of production) movie? A car with wheels wouldn't need "lift".
Precisely. His claims are contradictory. Energy conservation has to be violated SOMEWHERE!
Hunter Collins
How though? The moment it is cut from power it no longer would output thrust. A over-unity device would self power while putting out thrust.
