User blog comment:ProudAmerican1776/Coalition Page/@comment-13740085-20150306035222/@comment-13740085-20150306044308

As I said before, where did I say they ran on conventional fuel?

The missiles run on something called an impeller drive, something I made a post on the rp chat room back in November. It warps space around the missile, providing the ability for massive acceleration. While effective for missiles, said massive acceleration would be enough to turn a crew into jelly.

As for not detecting them, since they run on an unconventional drive, normal sensors woul be very unlikely to detect them. One part of "the American ships can't see visually what's happening" is that even american sensors aren't calibrated enough to detect and track them.