Gene Roddenberry (AKA GOD) layed down some ground rules for starship design, one of which was that there had to be an even number of engine nacelles, but no one really cares... :cry: .
However, that's probably one of the best single-nacelle designs out there!
Go To
http://ex-astris-scientia.org/articles/design.htm for a description of some "rules" that some people follow. These are pretty good, but that doesn't mean people have to follow them LOL!
PS Copy the URL, hotlinks do not work with this site!