One day, a long time ago, I was musing upon how a flying saucer might propel itself w/o rockets or some force field type of drive. Then I hit upon the same sort of rotational mass "throwing" inside the imaginary craft, that if designed just right, could lift the thing using giant cams surrounding the outer diameter, but inside the shell, of course. Just by rotating the heaviest part of the cam's mass with the greatest speed at the top of the "throw" and then slowing down after, enuf to allow the next cycle w/o losing the centrifical lift. You would need a lot of these piston/cams to get enuf lift and smooth out the process. But of course, I did not take into account Newton's Law concerning equal and opposite reactions. Over complicated concept, never even drew up a diagram, it was all in my head. <br />Same sort of methodology as this reaction-less drive, I guess. Interesting at the time, to me, but still useless. <div class="Discussion_UserSignature"> We must progress and expand, or we will stagnate and die. </div>