#rotor  rotating mechanism consisting of an assembly of rotating airfoils; horizontal rotors on a helicopter or compressor rotors of a jet engine
  supertype:  rotating_mechanism  a mechanism that rotates
  part:  impeller
  part of:  helicopter  jet_engine
  subtype:  main_rotor  rotor consisting of large rotating airfoils on a single-rotor helicopter that produce the lift to support the helicopter in the air
  subtype:  tail_rotor__anti-torque_rotor  rotor consisting of a rotating airfoil on the tail of a single-rotor helicopter; keeps the helicopter from spinning in the direction opposite to the rotation of the main rotor

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