![]() ![]() The air traveling along the bottom of the airfoil is slightly compressed and develops increased pressure. The air traveling across the top of the wing creates a reduced pressure on the upper surface. The important thing is that due to the curved upper surface the air flowing over the wing travels faster than the air flowing under the more or less flat bottom surface. Part of this air flows rapidly over the wing and part of it flows under the wing, both parts joining behind the trailing edge. When moving the leading edge of the wing pushes the air out of the way. When moving in the air, the aircraft produces an upward force which is called lift and acts at right angles to the direction of the air stream. The motion itself maintains those forces.ī. The aircraft is able to rise into the air and to keep in the air because of the forces working on it.
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