Question: why are the aerodynamic characteristics of a wing any different from the properties of its section? Airfoil can be respected as two-dimensional body, but any finite wing is a three-dimensional body ATtention should be paid for the flow pattern near the wing tips. And try to understand the reason for such a flow phenomena X For general cases, there is a spanwise velocity component on both top and bottom surface of the wing, but their direction are different XX A trailing vortex is created at each wing tip. These wing-tip vortices downstream of the wing induce a small downward velocity in the neighborhood of the wing itself.Question : why are the aerodynamic characteristics of a wing any different from the properties of its section? Airfoil can be respected as two-dimensional body, but any finite wing is a three-dimensional body. ※Attention should be paid for the flow pattern near the wing tips. And try to understand the reason for such a flow phenomena. ※ For general cases, there is a spanwise velocity component on both top and bottom surface of the wing, but their direction are different. ※ A trailing vortex is created at each wing tip. These wing-tip vortices downstream of the wing induce a small downward velocity in the neighborhood of the wing itself