[levi_n]

To your point, even if the theoretical drive is feasible but limited to sub C speeds, a drive that requires zero propulsion mass and where the contents of the bubble don't feel any acceleration would be absolutely huuuuuge for manned space flight.

[MCllorf]

yeah 100%. I do wonder about the energy requirements though because intuitively they don't totally make sense. I still don't understand why it couldn't be used as an infinite energy generator. Is it really just that the ship would move without gaining any momentum since it's the space around it moving instead of the ship itself?