I can't remember if I posted this already, but is anyone else following
this story?
http://www.ibtimes.co.uk/what-emdrive-why-should-i-care-1579181
tl;dr:
The idea is that electricity is converted into microwaves, and the
microwave photons are fired into a truncated cone-shaped closed metal
cavity. When fired into the cavity, the microwave photons push against the
large end of the cone, causing the small end to accelerate in the opposite
direction.
is remotely possible for the EmDrive to work. They say that according to
the law of conservation of momentum, in order for a thruster to gain
momentum in one direction, a propellant must be expelled in the opposite
one, and since the EmDrive is a closed system with no propellant, it
violates our understanding of physics.
