![]() If the angle of attack is increased further, more and more turbulences form in direction of the leading edge until the lift is no longer sufficient to keep the aircraft in the air. This means that the air flows no longer along the profile but forms turbulent flows (Fig 4).Īt first the turbulences form at the trailing edge. However, speed and angle of attack cannot be increased indefinitely, because the airflow on the upper side can stall. For that reason aircrafts that only fly slowly possess thick profiles, whereas for very fast aircrafts slim profiles are sufficient for generation of the lift. But at the same time the air resistance increases as well. Generally it holds that the lift increases with the velocity of the aircraft. This angle of attack additionally causes an increase in negative pressure on the upper side, because the air needs to cover an even greater distance and is thus accelerated even more.īut due to the angle of the wing the air resistance is increased as well, which has to be compensated with a greater propulsion power. ![]()
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