Von Karman on Incorrect KZ-theory of Lift Talk:Lift (force) - Wikipedia Why does the FAA keep teaching an incorrect explanation ... Bernoulli's Theorem: Explains lift as a function of the high and low air velocities generated on upper and lower surfaces due to the airfoil profile. If you were to ask NASA, they would tell you there are multiple INCORRECT theories on why lift occurs when an airfoil moves through air. It contrasts with the drag force, which is the component of the force parallel to the flow direction. Mechanical Engineering. The second page of the article seems to address this and calls it an incorrect lift theory. There are many theories of how lift is generated. Open the slides called Aerodynamic Forces, Incorrect Theory #1, Incorrect Theory #2, and Incorrect Theory #3 (with text) and read the explanations on lift and the popular incorrect theories on how lift is produced. The Kutta condition gives some insight into why airfoils always have sharp trailing . For an aircraft wing, both the upper and lower surfaces contribute to the flow turning. It is simple, intuitively appealing (blowing over an airfoil is often invoked, along with an erroneous picture of flow lines around an asymmetric wing), and gets things done quickly. Kutta-Zhukosky Lift Theory. Computer drawing of an airfoil with description of the incorrect Equal Transit Theory. Engineering Science. just as IR posts, yes NASA refutes 3 incorrect theories of lift, but then (not reported by Johnson) go on to say the Newton and Bernoulli are both correct. The generally accepted explanation for how an airfoil works is wrong. Lift is the key aerodynamic force that keeps objects in the air. NASA. The (incorrect) Kutta-Zhukovsky theory of lift has led to a common (incorrect) idea that the generation of lift requires a sharp trailing edge as expressed on Wikipedia:. NASA. The long-standing equal transit time (ETT) theory to explain lift has been proven false. Answer (1 of 3): You're half right. Publication Date: 2004. Physics And Mathematics . If incorrect, why was it ever taught? The generally accepted explanation for how an airfoil works is wrong. yeah, that was were i was before the other thread was RF'd (apparently the OP was a student). There are many theories of how lift is generated. Lift is generated by pr. Neglecting the upper surface's part in turning the flow leads to an incorrect theory of lift. The second page of the article seems to address this and calls it an incorrect lift theory. According to Shafer "Lift is caused by Lift Demons. Non-Trivial but Incorrect. The theory described on this slide is one of the most widely circulated, incorrect explanations. The most popular incorrect theory of lift arises from a mis-application of Bernoulli's equation. "Equal Transit" theory "Equal Transit" theory, also known as the "Longer Path" theory, states that because aerofoils are shaped with the upper surface longer than the bottom, air molecules that pass over the top of the aerofoil have further to travel than underneath. Abstract: The role of Lift Demons in aeronautics was first explained in 1994 by Mary Shafer (NASA). Fig 9 Coefficient of lift versus the effective angle of attack. It also relies on the theory of equal transit, which s tates that due to the upper and lower surfaces of an aerofoil having different lengths, air must travel faster over the longer surface in order to meet airflow flowing from the shorter . Incorrect Lift Theory. 3. Answer (1 of 3): You're half right. A similar lift versus angle of attack relationship is found for all wings, independent of their design. But we do know what the correct one is, and I couldn't find any reference to NASA claiming otherwise. Your customizable and curated collection of the best in trusted news plus coverage of sports, entertainment, money, weather, travel, health and lifestyle, combined with Outlook/Hotmail, Facebook . Incorrect Lift Theory. Neglecting the upper surface's part in turning the flow leads to an incorrect theory of lift. Computer Science. Unfortunately, many of the theories found in encyclopedias, on web sites, and even in some textbooks are incorrect, causing unnecessary confusion for students.. It suggests that air flowing over the top of a cambered wing surface is compressed, as in a Venturi tube, and therefore moves more quickly than air that is not compressed. It rests on the following incorrect logic: Circulation around a wing (=A) implies lift (=B) and since there is lift (B is true) there must be circulation (A is true). Mechanical Engineering. The thing is, the conventional explanation isn't entirely wrong. "Equal Transit" theory "Equal Transit" theory, also known as the "Longer Path" theory, states that because aerofoils are shaped with the upper surface longer than the bottom, air molecules that pass over the top of the aerofoil have further to travel than underneath. Incorrect theory of lift according to NASA. The way I approach the subject is to explain this is what you are required to learn for the exam, but please be aware that it isn't strictly correct, but I would avoid explaining any other theory due to the complexity involved . The whole point of the article is that it's not that simple: > The real details of how an object generates lift are very complex and do not lend themselves to simplification. Science And Technology. yeah, that was were i was before the other thread was RF'd (apparently the OP was a student). Kutta-Zhukosky Lift Theory. It suggests that air flowing over the top of a cambered wing surface is compressed, as in a Venturi tube, and therefore moves more quickly than air that is not compressed. The trailing edge may be sharp, flat or rounded (or have some other more complex slotted, serrated or perforated design away from sharp). The Kutta condition gives some insight into why airfoils always have sharp trailing . In order to fly an aircraft, something (lift) needs to press it in the opposite Download scientific diagram | 7. The theory described on this slide is often seen on web sites and in popular literature. 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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