#blade.rotating_mechanism__vane  flat surface that rotates and pushes against air or water
  supertype:  #rotating_mechanism  a mechanism that rotates
  part of:  #helicopter  #oar  #propeller  #turbine  #aerogenerator
  subtype:  #fan_blade__fanblade  blade of a rotating fan
  subtype:  #impeller  the blade of a rotor (as in the compressor of a jet engine)
  subtype:  #paddle.blade  a blade of a paddle wheel or water wheel
  subtype:  #rudder_blade  the vertical blade on a rudder

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