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A collection of blades organized around a central hub, designed to create thrust as required by the pilot.

A helicopter will almost always have two rotors, arranged in a variety of ways:

  • Coaxial
Two main rotors, stacked on a common axis but rotating in opposite directions, canceling out each other's torque reaction.
  • Conventional
One large main rotor on top, and a smaller but faster turning tail rotor mounted remotely to counter the torque reaction.
  • Tandem
Two large main rotors, mounted on separate axes, and rotating in opposite directions.

Other configurations exist.

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