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If you had an empty sealed pipe in a ring shape, would you expect it to suddenly have "lift"?[attachment=18474]Now, if you propelled air in a circle around inside of the ring, so that it passes by two fans, and over two fixed "wings", then what?[attachment=18476]You would find that in the second situation, you would get no more lift than in the first situation. Consider what is happening to the air outside of your ring, which is absolutely nothing. Pressures inside the ring would all cancel out, and there would be no net movement of the ring.