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Backwash Causes Lift?
flightoffancy writes:
I don't deny those facts; but the greater the curve of the wing the more the air pushes down behind the wing. If that were so, then an airfoil with a half-circle for a cross-section would produce enormous lift. In fact, this isn't the case. Notice the smoke flow in the photo I link to below: http://www.aa.washington.edu/uwal/uw.../tech%20guide% 20pics/smokeflowvis.gif Granted it's at a high AoA. I'm just concluding what I have read about wing curvature is consistent with what I see the smoke doing in the picture. But it would do the same thing with a flat airfoil. The explanation of why wings with greater curve bend the air down more I wouldn't want to say without studying aerodynamics more thoroughly. A greater curve does not increase downwash, unless it also changes the effective angle of attack. AOA is everything. |
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