Transoscillatory soundwave stacking. Using a similar function to a beam of light in a mirrored ball. However, sound is created by kinetic forces, and thus has more effect. If a theoretical container was created, wouldn't it be hypothetically possible to hone compressed soundwaves into further kinetic function? You could at least build a generation ship like that.
If matter and antimatter are exact opposites, antimatter will stretch time in the opposite way of matter. Thus, negating an amount of matter would allow infinitely fast travel.
I prefer the idea of generation ships. More feasible. I was thinking, what if a wood burning engine was to be implemented, powered by gengineered bamboo? Bamboo can grow VERY fast. Genetically engineer that to create compounds similar tosolid fuel, and you can fly at about 100mph for pretty much ever. Until you have no water left.