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| View Original: | Equal transit-time NASA wrong1 es.svg (527x178) | |||
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| Keywords: Equal transit-time NASA wrong1 es.svg There are many theories of how lift is generated Unfortunately many of the theories found in encyclopedias on web sites and even in some textbooks are incorrect causing unnecessary confusion for students The theory described on this slide is one of the most widely circulated incorrect explanations The theory can be labeled the Longer Path theory or the Equal Transit Time theory The theory states that airfoils are shaped with the upper surface longer than the bottom The air molecules the little colored balls on the figure have farther to travel over the top of the airfoil than along the bottom In order to meet up at the trailing edge the molecules going over the top of the wing must travel faster than the molecules moving under the wing Because the upper flow is faster then from Bernoulli's equation the pressure is lower The difference in pressure across the airfoil produces the lift Source http //www grc nasa gov/WWW/K-12/airplane/wrong1 html Image was cropped from original slide Equal_transit-time_NASA_wrong1 gif 2009-06-01 19 34 UTC Equal_transit-time_NASA_wrong1 gif NASA derivative work Retama <span class signature-talk >talk</span> Vectorisation spanish translation Retama Equal_transit-time_NASA_wrong1 gif original upload log This image is a derivative work of the following images File Equal_transit-time_NASA_wrong1 gif licensed with PD-USGov-NASA/es 2009-06-01T18 32 35Z Retama 586x264 4585 Bytes <nowiki> There are many theories of how lift is generated Unfortunately many of the theories found in encyclopedias on web sites and even in some textbooks are incorrect causing unneces</nowiki> Uploaded with derivativeFX Bernoulli's equation Diagrams of fluid flow past airfoils Diagrams of forces applying on airfoils | ||||
