Okay so here's why this is trivially unsound from the perspective of standard modern physics. 1) Newton II: F= dp/dt. This particular formulation of Newtons La

Okay so here's why this is trivially unsound from the perspective of standard modern physics. 1) Newton II: F= dp/dt. This particular formulation of Newtons Law is valid in relativity. 2) Newton III: My own formulation of this is all force arrows are "double-headed". Again, valid in relativity also. So any dp/dt on anything inside your engine, requires equal and opposite dp/dt on something else. The only new thing that they're doing is trying to make the mass relativistic, so p /= mv. I have no need of the hypothesis that p=mv in this refutation. Unless there is something outside that is taking the dp/dt, that this is only ever going to oscillate. The reason is this. Lets define the "system" as everything inside the engine at t=0, and define the "system" as all particles and fields which would not exist if it weren't for the system at t=0. The problem is this. The total momentum of the "system" can never change from it's initial momentum. It looks like the idea in mind is that magic will happen because of the non-linearity in the momentum to velocity relation due to relativity. But if we look at this system as a whole, it's total momentum is fixed at all times at the initial total momentum, which implies an initial total system drift velocity, which only depends on account the total rest mass of the system, even in relativity. The only way to increase the velocity of the engine over is to decrease the rest mass of the engine over the course of many engine cycles. That is, we need some of the mass-energy of the system to simply escapes the engine, in the form of escaping particles or electromagnetic waves. Sadly, there is nothing that they've shown here that is an explanation of how we circumvent that part of engine physics.