User talk:VirtualLibri/Archive1

Main Talk Page Talk Page Archive 1

VirtualLibri, you are invited to the Teahouse!

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Bernoulli and lift on an airfoil

Hello VirtualLibri. You appear to believe Bernoulli’s principle applied to generation of lift is “incorrect”. Such a view shows misunderstanding of B’s principle. You also appear to believe NASA and some universities believe the same. I have reverted your edit. Please discuss your views on the Talk page. Dolphin (t) 22:05, 28 April 2018 (UTC)

Bernoulli's principal is not very relevant to the generation of lift, and is misleading in the context of the article. This is what the source from NASA stated. VirtualLibri (talk) 21:20, 29 April 2018 (UTC)

Thanks for your prompt reply. I have been examining all your cited sources very closely. I will comment on each of them in the next 24 - 36 hours. Cheers! Dolphin (t) 21:59, 29 April 2018 (UTC)

In your amendment dated 2018/4/28 (diff) you cited the NASA webpage Incorrect Theory #3. In your edit summary you wrote “.. the information was incorrect. I have replaced it with correct information with citation from several sources such as NASA ..” On your Talk page you wrote “This is what the source from NASA stated.”

I went looking at the NASA page “Incorrect Theory #3” to see what it actually said. This page addresses the so-called Venturi Theory that attempts to explain why air moves faster across the top of an airfoil than across the bottom. The Venturi Theory is a poor explanation of why the air moves faster, so it is no surprise that this NASA page dismisses it as incorrect. However, the Venturi Theory and Bernoulli’s principle are two very different things. The NASA page dismisses the Venturi Theory but it does not dismiss Bernoulli or the application of Bernoulli to airfoils.

Near the bottom of the NASA page are four bulleted items of information. The fourth bullet begins: "The part of the theory about Bernoulli's equation and a difference in pressure existing across the airfoil is correct."

So the NASA page you cited actually states that Bernoulli’s equation and its application to the generation of lift is correct. The NASA page does not say use of Bernoulli is incorrect.

In the next day or so I will look closely at the other published sources you cited. Dolphin (t) 12:39, 30 April 2018 (UTC)

Sounds good. It is also possible that I misunderstood what the sources were saying. VirtualLibri (talk) 02:05, 1 May 2018 (UTC)

You also cited the article “How Planes Fly: What They Taught You In School Was Wrong” – Daniel Miessler. I have read it closely.

This web page is one of many that debunk and dismiss the Equal Transit Time Theory. However, Daniel Miessler says almost nothing about Bernoulli. He certainly doesn’t say Bernoulli is inappropriate or incorrect. This page ends with four Notes; the fourth Note says:

“Keep in mind that the fact that Equal Transit Time theory is incorrect does not mean that the Bernoulli Principle is flawed. The Equal Transit Time Fallacy is based on a misunderstanding of the Bernoulli Principle, and does not diminish the principle itself in any way.”

Dolphin (t) 05:59, 1 May 2018 (UTC)

Okay. I guess I missed that part. I have re-read the article and now I see that it says that the increased air speed is due to the pressure differences, and not that the increased air speed is what decreases the pressure like I thought it did (which would be the equal transit theory). VirtualLibri (talk) 19:45, 1 May 2018 (UTC)

I have re-added some of my sources but under the preexisting section stating that there are false theorems such as equal transit. VirtualLibri (talk) 19:53, 1 May 2018 (UTC)