Helicopter
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A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL aircraft cannot perform.
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Facts
Etymology
Design characteristics
Rotor system
Anti-torque
Engines
Flight controls
Compound helicopter
Flight
Hover
Transition from hover to forward flight
Uses
Market
Early design
First flights
Early development
First practical rotorcraft
Single lift-rotor success
American single-rotor beginnings
Birth of an industry
Turbine age
Maximum speed limit
Noise
Vibration
Transmission
Hazards
Bibliography