Graviman, stop trying to argue with what you think I'm saying, and actually read my last post.
I'm not over analysing, I'm exploring my own understanding, you obviously don't want to help, but please don't misrepresent me.
Waspy, you are saying that by putting the rotating weight on a flying saucer it will defy gravity?
Anybody could have said, "Jiff, no reaction mass, no change in momentum". But like all such intellectual exercises I think it is important to understand where the misunderstanding comes from.
A force acts when on one side of the machine, greater in magnitude than it does when on the other side of the machine. This is a fact.