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I have to look closer at the conditions for a warp drive but the theory does not let us generate any kind of gravitational field we want. It doesn’t let us generate a gravitational monopole or if it does it must be an attractive gravitational monopoly and not a repulsive gravitational monopole which I think would be analogous to the negative energy required for the Huckleberry drive.

I am not saying you can’t generate a warp drive with this theory without using negative energy but the fact that you can generate gravity does not imply you can make a warp drive. The steps in between must be filled in. Also even if you could generate warp drive like conditions I suspect that the necessary fields must be produced externally from the ship. Thus it would be more like a warp tunnel that we must build to the next star and it would require that gravity generating machines be placed along the route. This sounds prohibitively expensive and not very practical.

Curiously the paper implies due to the discreteness of space Einstein’s theory or relativity breaks down at near the speed of light. This is because length contraction can not be infinite. However, once this minimum length contracting is met the ship would be unobservable. I am not sure of the implications of this in terms of paradoxes and faster then light travel but it certainly makes me scratch my head and go hmmmmmm…..

As for the propellantless propulsion application, it's like trying to predict the performance of a modern rocket with only knowledge of the first Chinese fireworks.

The paper even said that you can’t use the gravity machine as a space ship drive. I think it probably for every point it repeals the anti-gravity machines repels from the earth it attracts the earth an equal amount in other locations. To bad my electromagnetism knowledge is getting fuzzy because the math looks really similar. I’ve thought of some advantages of anti-gravity over electromagnetism. The biggest advantage I see of anti gravity is that the pilot can be accelerated without feeling the g forces because the acceleration would be uniform on every part of the body (like free fall) and would not be a push from the ship floor. I suspect you could also use this to produce artificial gravity in space ships without requiring the ship to rotate. However that might not make economic since. So essentially anti-gravity could give the ship a velocity boost with zero g forces on the pilot before the first stage kicks in. It sounds kind of cool but just because it is possible does not mean it is practical. The engineering details still must be worked out.