[Ste41]

E. Eugene Larrabee con una battuta "spiega" perchè c'è sempre di mezzo il povero bernulli in un suo articolo, "The Screw Propeller"

An explanation of thrust and torque loads awaited the development of the "vortex," or circulation, theory of lift by Kutta and Joukowsky in the period between 1902 and 1911.
In Joukowsky’s version of the theory the ideal flow of an inviscid fluid around a circular cylinder is conformally “mapped,” or transformed, into the corresponding flow around an airfoil with a sharp trailing edge . Vorticity, or circulation, is added to the flow around the cylinder by introducing an idealized “bound,” or “line,” vortex of arbitrare strength coincident whit the center of the cylinder.
The strength of the vortex is adjusted mathematically until the flow around the cylinder stagnates at a singular point that coincides in the transformation whit the trailing edge of the airfoil.
The hypothetical circulation of inviscid fluida round a cylinder of infinite length superficially resembles the flow of real fluida round a rotatine spere with a rounghened surface such as a tennis ball or golf ball moving with backspin. Lift is produced as a consequence of the acceleration of the air flowing over the top of the ball and deceleration of the air flowing under the ball. In accordance with a well-known theorem of the 18th-century Swiss mathematician Daniel Bernulli, the fluid in the accelerated flow has a lower static pressare than the fluid in the decelerated flow, so that the ball is pushed upward from bolow. (A tennis ball hit with topspin receives a corresponding downward push from above.) As a result the usual secondary-school explanation of the airfoil lift in terms of Bernulli’s theorem is entirely inadequate