#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
  subtype:  main_rotor  tail_rotor
  part of:  helicopter  jet_engine
  part:  impeller  the blade of a rotor (as in the compressor of a jet engine)

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