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The key to the lift generation is the curvature of the streamlines. Forget the popular, but unfortunately wrong explanations based on the non-equidistant particle paths. The simplest example will be if you place a plate with an angle of attack in the subsonic flow: the streamlines will get curved on the both plate sides as the flow turns. Therefore, even a ...


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I’m not sure where to pitch this but I’ll have a go... There are a few ways to look at it - perhaps simplest is that the top surface is longer the an the straight-line distance across the chord and so the airflow must speed up as it is effectively stretched. If the air were stationary then the surrounding air would move in to equalise the pressure, but it’...


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Helicopters use speed of the wing as a proxy for angle of attack in a similar manner to airplanes; in the airplane's case it's forward airspeed and in the helicopter's case it's "rotary airspeed", expressed as rotor rpm. In the airplane you have the bottom of the green arc on the airspeed indicator; in the helicopter it's the bottom of the green ...


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