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the problem is that thrust doesn't just appear out of nowhere, if you make a veturi the air will travel out the nozzle faster than it enters, but it's due to the pressure difference, and the thrust created out the back is nowhere near the drag created in the front.
i understand that fluid dynamics is very broad, but the spoon demonstration is hydrodynamics not aerodynamics, the flow of water is completely separate from surrounding air, that is more of a demonstration of surface tension.
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Last edited by Joenavy85; 03-29-2011 at 04:10 PM..
Reason: looked up coanda effect
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