File:Equal transit-time NASA wrong1.gif

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Equal_transit-time_NASA_wrong1.gif (586 × 264 pixels, file size: 4 KB, MIME type: image/gif)

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Summary

Description
English: 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: [1]

Image was cropped from original slide.
Date
Source en:File:Equal_transit-time_NASA_wrong1.gif
Author NASA
Permission
(Reusing this file)		 PD
Other versions Derivative works of this file:  Equal transit-time NASA wrong1 es.svg

Licensing

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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1 June 2009

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current18:32, 1 June 2009Thumbnail for version as of 18:32, 1 June 2009586 × 264 (4 KB)wikimediacommons>Retama{{Information |Description=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.

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