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Pic related: this thing on Nasa's website, of all places, is wrong. The fallacy in that reasoning is that two adjacent finite elements of air at the front edge of the wing will recombine to be adjacent finite elements at the back of the wing. This is an unphysical boundary condition. This small minded view of the generation of aerodynamic lift views the wing and the surrounding air as a closed system. In practice, when the air on the top surface of the wing is rarefied to decrease pressure by its passage over a longer surface, air from the rest of the atmosphere rushes in to counteract that effect. This necessarily means that the finite element of air passing along the bottom recombines at the trailing edge with a finite element from the top which might not be the same one it was adjacent to at the leading edge of the wing.
The way that lift is generated is this: The air is not moving up or down. Then the airplane moves forward through the air. The angle of attack of the wing deflects some of the air down. Due to conservation of momentum, the plane has to go up because the wing gave the air some downward momentum. This is why the airplane has to go fast to fly: it has to push air down greater than or equal to the weight of the plane, and the only way the small wing surface can do that is by pushing down a lot of air. The faster the plane goes, the more air hits the wing. Also, due to Newton's law about equal and opposite forces, the force of the wing pushing the air down is countered with the force of the air pushing up on the wing.
RAPE DICK!
upper left outer shaft zapper
