#rotor_blade__rotorblade__rotary_wing  the long airfoil that rotates to provide the lift that supports a helicopter in the air
  supertype:  #airfoil__control_surface__surface  a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight
  part of:  #main_rotor  rotor consisting of large rotating airfoils on a single-rotor helicopter that produce the lift to support the helicopter in the air

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