Why say anything that would just mis-lead? I mean if I knew I would gladly share as to how this works. But our understanding of these things can not be presented with a limited mind set as they defy everything we know of physics.
In scientific terms, we can deal with the ideal, the first, the second, and the third approximations. But to just generalize anything of the nature of these crafts in just not written and available to the public in actual truth. It merely comes down to our limited perceptions as to how we think they should work vs. how they really work. We are only beginning to get a peak of what we use as general physics is really all about.
I'm not going to tell you gravity doesn't exist, because I have been hit in the head by falling apples a few times and rain falls from this sky. At the same time I am not going to mis lead anyone based in the second hand, by coming up with what appears to be some logical theory that isn't proven.
Also to add to that, the mind set of the ones flying these things. Way different than our limited mind sets. So again why say anything that could lead to disinformation?
Here's one of my favorites! Enjoy!
http://www.youtube.com/watch?v=pQjB3EBLdvA