Coolant [Spaceships]

[Rupert]

Originally Posted by Johnny1A.2

An unmodified reactionless drive (that is, the classic by-your-bootstraps) has the opposite problem, it's too good (aside from violating conservation of momentum). Before long, some bright PC will get a funny look on his face and the next think you know people are throwing R-bombs at each other, and converting planets into asteroid belts.

They will also have perpetual motion engines that produce truly ridiculous amounts of power, and probably half a dozen other things before breakfast.