Originally Posted by ShoeDLG
When you push a car, the force you are applying is in the direction of the car's motion... it does work. A wing's lift force is perpendicular to the motion of the wing... it cannot do any work. When you lift water, you move it in the direction of the applied force. A wing does not move in the direction of the lift force.
What does the work which keeps a glider aloft at a constant altitude?