What is the Wing in Ground Effect?

Answer 1

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Answer 2

A wing creates most of it's lift through a natural mechanism quantified by the Bernoulli's Principle: basically two points along a fluid stream have a constant sum of static and dynamic pressures. Thus when a fluid is caused to speed up (relatively speaking) by the shape of an airfoil, as over the top of a wing, which has a greater convex curve than the bottom of the wing, the fluid has greater dynamic pressure by means of it's greater velocity, and thus a lower static pressure. A wing producing lift has a lower static pressure at the top of the wing than at the bottom of the wing, and it is this pressure difference applied over the area of the wing that creates an upward force called lift. There is another mechanism that creates lift to a smaller degree: the reactive force of the air being deflected downward because of the angle of attack of the wing ( the angle of the air stream relative to the cord line of the wing).

When the wing is in close proximity to a planar barrier on the bottom side of the wing the deflected air has less freedom to diffuse, creating a higher static pressure than the surrounding air pressure. Thus, the differential in pressure between the upper and lower wing surfaces is greater than would be the case otherwise. This is called "ground effect"

Answer 3

The airplane flies by creating a lift using a wing. The wing creates the lift by pushing the air down. This downward component of the air will push the ground and create more lift near the ground. This is the ground effect.