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Jan 24, 2023 at 1:35 comment added John Doty @Yakk I believe the op was interested in open structures in air. That's how I read the question. Closed structures and solids are off the table, I believe. Even boats.
Jan 24, 2023 at 1:29 comment added Yakk Balloons would like to have a word with you. They generate lift statically! Also, my cat, which is sitting on a sofa and not moving seems to not be falling into the core of the earth despite gravity. ;) My point is, imagine a device that lowers pressure above the wing; the wing goes up even if it is not moving forward.
Jan 22, 2023 at 16:40 vote accept Fulano
Jan 21, 2023 at 22:36 history answered John Doty CC BY-SA 4.0