#rudder.steering_system  (nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel
  supertype:  #steering_system__steering_mechanism  a mechanism by which something is steered (especially a motor vehicle)
  part of:  #vessel.craft
  part:  #rudder_blade  the vertical blade on a rudder
  part:  #rudderpost__rudderstock  a vertical post at the forward edge of a rudder that enables the rudder to pivot
  part:  #tiller  lever used to turn the rudder on a boat

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