The problem with this is that it will work for anything. A series coupled
DC motor will run to infinity RPMs, and therefore you can attach a
generator to it and obtain overunity.
No that is not the case, as the RPM of the motor increases so will the
voltage you need to supply and so will the power to maintain a torque
output.
(note the maintain a torque output part there, an ideal series wound
motor with no load will reach infinity RPM)
There! You overunity seekers. Go back to lurking. We are not on perpetual
motion yet. Unless I have overlooked something.
The difference with the proposed thruster is the fixed power input
results in a fixed force output regardless of the speed of the system,
that is the bit where it breaks everything.
And they have measurements that are perhaps less trustworthy than they
initially seemed which supported their assertion.
In all other cases the power demand to produce the torque is
proportional to the speed of the system.
It is an "unbalanced force", in every case F = MA if something pushes in
one way it is balanced by something pushing in the other.
If the thruster worked, sure it took power in, but it produces a force
without pushing on something else and from there there are any number of
ways of turning that into perpetual motion.
I do still wonder where a photonic system fails and I'd really like to
hear an explanation for why it would, though I fear the answer involves
actual numbers not just abstract thought to work. ;->