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Support Boeing 747 of Air New Zealand International Airport taking off from Christchurch, New Zealand. Airbus A319 of TAP Portugal Air Force One flying over the mountain RushmoreUm handle plane flight because of aerodynamic reactions that occur when air passes at high speed by the wing. When this happens, he is forced to pass underneath and on top of this the same time. The length of the wing is greater at the top thanks to a curve, and because of this, the air pressure in speed does not have enough to return to the profile of this curvature, creating a zone of low pressure in the upper back of the wing. In the pressure at the bottom much greater, because of that face does not have a curved profile, but closer to a straight, the kite is worth the difference in impact of gaseous air (more on the bottom, lower above) to gain support . Some explanations rely on a misinterpretation from the Bernoulli principle, saying that the flow of air at the top of a kite is faster than at the bottom. The truth is that both flows have virtually equal speeds, but with different directions. Tests show that exhaustively repeated a molecule of air that flows at the bottom of the wing travels much faster than the same molecule at the top, because obviously logical to move in a more direct path and not curve, as in upper surface . While much present in almost all explanations on aerodynamics, the theory of air faster above the wing is an explanation wrong and illogical, because there is no energy source to accelerate the air over a wing. This is only a matter of wing profile and aerodynamics. It is clear that the effect of the impact of air molecules in a more drastic at the bottom of the wing that allows a free and in their normal conditions, always tends to rise, never to fall. The planes need a high speed so that the difference between the air pressure under and on the wing is sufficient to support the aircraft. Because of these high speeds, a plane must go a certain distance from ground before reaching the speed enough for takeoff, which justifies the need for a runway on land and plan for long reach. For larger and heavier aircraft, the greater will be the length of the track and speed needed for takeoff because of the greater effort needed. The track also serves the opposite purpose: it allows the aircraft touch the ground at high speed and have room for frenar safely, smoothly moving between air vehicle to land again