Timeline for What is the actual air speed over and under a wing due to Bernoulli's Principle?
Current License: CC BY-SA 3.0
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| Mar 26, 2015 at 2:33 | comment | added | David K | Experiments with smoke have shown that when a mass of air is separated in two parts by the leading edge, the part on the bottom of the wing stays in contact with the wing longer than the part on top, and after the airplane passes the two parts remain separated by a considerable distance. The speed difference over the wing's surface is much larger than the distances along that surface would indicate. This also helps explain why the aircraft doesn't magically float away while sitting on the ground. | |
| Mar 25, 2015 at 17:34 | history | edited | habu | CC BY-SA 3.0 |
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| Mar 25, 2015 at 14:10 | comment | added | habu | @erich - one way that you can think of with respect to changing the aoa is of a pilot-driven change in the wing's camber. Everything flows from there i.e. "thicker" camber => greater pressure differential (i.a.w. Bernoulli) => greater cL => etc. | |
| Mar 25, 2015 at 5:28 | comment | added | FreeMan | Excellent answer. You missed the first, unnumbered question, though - how much faster does the air flow over the top of the wing than underneath, specifically for a 747-400 at Mach 0.85. | |
| Mar 25, 2015 at 3:47 | comment | added | Erich | great start! just a minor course correction here: i'm interested only in the bernoulli-related effects of changing aoa in question 2, not just increased cL. | |
| Mar 25, 2015 at 3:36 | history | answered | habu | CC BY-SA 3.0 |