Essentially, helicopters stay up for the same reason airplanes move forward through the air. A rotating propeller creates changes in air pressure, lowering it in some areas and raising it in others. Combined with a specially curved wing, the effect is known as lift, and it's what pulls an airplane forward or allows helicopters to lift off the ground vertically. Without some sort of rotary propeller system, neither aircraft would ever leave the ground.
There are two basic types of aircraft, fixed-wing and..................
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