Consider an airfoil (a wing) in an airflow. When angle of attack increases, at some point the flow start to separate from trailing edge. By increasing the angle of attack more, this separation area
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aerodynamics - Why is the pressure lowest towards the front of an
Boundary Layer Separation and Pressure Drag
aerodynamics - What amount of lift would be created in the
Evolutionary understanding of airfoil lift
fluid mechanics - Why do wing-tip vortices cause an induced angle
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Why does Aerodynamic Center move to 50% chord when supersonic
Airfoil thickness effects on flow and acoustic characteristics
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aerodynamics - Is pressure lower than ambient on the pressure
aircraft design - Ground effect and Lift coefficient - Aviation