>>14302567conservation of momentum means that such a system would remain at rest. if the magnet on the right wasn't physically connected to the troll then the troll would accelerate forward but then the right magnet would have to keep moving back somehow....The only physically possible field propulsion drive that I can think of is one were your craft causes the density of space around itself to decrease by spatial expansion. If you can apply a gradient to this density decrease then universe will push back on you in any given direction giving you a velocity vector. momentum is conserved because you are technically stealing it from the universe in the same way that gravity can transfer momentum through the warping of space. What kind of field could cause space to expand though?
