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A reactionless drive (that just pushes on spacetime instead of trying to alter it) is probably even more practical.

vacuum propeller. Imagine if a submarine had to carry all the water it's propeller pushes on? That's rockets today. If we could make a vacuum propeller, that acts directly upon space-time, it would radically transform the prospect of space travel.

They are doing research in this direction. http://en.wikipedia.org/wiki/Quantum_vacuum_plasma_thruster

Your comment just put a big goofy grin on my face.

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