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On Oct 7, 11:02 pm, flightoffancy wrote:
Did you mess with NASA's online simulations of airfoils? Yes, 15 minutes ago, in fact after taking a break from my very tedious work. Those suggest that the air both "on top" and "on the bottom" of an airfoil get turned as the airfoil's AoA changes. Those have to be put in quotes since an aircraft (with the proper engine) can be flown upside down and in other orientations. I did notice the turning. The article is claiming that the upper surface of the wing "turns" the upper flow. Link: http://www.grc.nasa.gov/WWW/K-12/airplane/right2.html I must admit that I am having problems with this explanation. It is extremely vague? What is the turning? How, exactly, does the wing "turn" the flow. The air is made up of molecules. If it is upper surface of the wing that is turning does air molecules so that they have a velocity component that is downward, how is this happening? Since when, could one body, A, of any kind, that does not involve gravitational or electrostatic fields, induce another body B, to move in a direction that has a component vector that is aimed directly at B? Also NASA does not just explain why the longer length theory, the Newtonian theory, and Bernoulli theories are incorrect, they also elaborate what the correct equations to properly calculate observed lift are, though I didn't see an example calculation. So they do say what is correct, as well as what is not.- Hide quoted text - True. This "turning" theory of NASA makes me suspicious. If anyone else has any qualtitative explanation of what they mean by the upper surface of the wing foil turning the air so that it has a downward component in its velocity, I would like to see it. Finally, I do agree that the geometry, AoA, etc...interacts with the atmospher in such a way that the net result of the flow on the top surface of the wing is back and downward. What I don't see is the how the wing itself is "turning" that flow. -Le Chaud Lapin- |
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