A helicopter is an aircraft that is lifted and propelled by one or more horizontal rotors, each rotor consisting of two or more rotor blades. Helicopters are classified as rotorcraft or rotary-wing aircraft to distinguish them from fixed-wing aircraft because the helicopter achieves lift with the rotor blades which rotate around a mast.
A helicopter takes off vertically by using a set of blades shaped like aerofoils to generate lift by rotating the blades at high speed and as such does not require runways
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