This one goes 0.1 speed of light, but if I'm correct, with my solution, you could transport humans at that speed.
https://www.nasa.gov/sites/default/files/atoms/files/slough_niac_2014_fdr_v2_tagged.pdf
Wicked!
I did some calculations :P and found that you could get more than the speed of light with a Tsar Bomb:
50 megatons is 4.8 B stronger than jet fuel.
Even if you didn't have enough plasma to stop a spaceship, you could use athmospheres of all kinds, going tipsy-turvy around a solar system until you make it; that would be a virtuose feat of accuracy, but theoretically feasible; and
what's to say that light isn't an expression of mass, just...
I have two scenarios.
One; imagine that, at the same time as the engine of your ship is ignited, there is also a device detonated inside the ship. If timed correctly, the difference between the two would equal out, right? For now, there's one huge problem and that's making sure the aim is...