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That body of work is known as the Lanchester-Prandtl wing theory.
His work on wing theory, which followed similar work by a British physicist, Frederick W. Lanchester, but was carried out independently, elucidated the process of airflow over airplane wings of finite span.
In this paper, we investigate the locomotion of fish and birds by applying a new unsteady, flexible wing theory that takes into account the strong nonlinear dynamics semi-analytically.
While in classical stationary wing theory, the tip vortices (TiVs) are seen as wasted energy, in flapping flight, they can interact with the LEV to enhance lift without increasing the power requirements.
In bats the tail forms a continuation of the wing membrane (separated by the leg bones) and not a separate lifting surface, therefore, delta wing theory is definitely not applicable.
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Prandtl made decisive advances in boundary-layer and wing theories, and his work became the fundamental material of aerodynamics.
Iñárritu is a director much given to the old butterfly-wing theory of the continual influential intersection of human lives as exemplified by his Amores Perros, which was rather wonderful if you don't mind reading subtitles and watching dogs tear out each others' throat.
The piece — which seemed, at first sight, to test the outer limits of the butterfly-flapping-its-wings theory — quoted Brown Brothers Harriman prognosticating: "One possible outcome of the [IMF] turmoil could be to accelerate the bid by EM [emerging-market] countries for more influence and a high-profile position at the fund".
She parrots and peddles every silly right-wing theory to come down the pike in transparent attempts to get Web hits.
Yesterday we noted that CNN host Lou Dobbs' "birther" obsession -- the right-wing theory Dobbs has been trumpeting that President Obama has no U.S. birth certificate, is an "undocumented" alien, and his presidency is "illegal" -- has been good for creating controversy and hot feelings but bad for CNN's ratings.
For example, although delta-wing theory has been used to predict tail performance in birds [8], more recent work [1], [18] suggests this approach is not entirely valid.
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