A helicopter is an aircraft with at least one horizontal propeller or rotor which enables the craft to take off and land vertically, move in any direction, and remain stationary in the air.
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In an airplane, the flight path of the wing is fixed in relation to its forward flight; in a helicopter, the flight path of the rotor advances forward (to the helicopter’s nose) and then rearward (to the helicopter’s tail) in the process of its circular movement.