#hull  the frame or body of ship
  supertype:  #physical_structure__structure__construction  a thing constructed; a complex construction or entity; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"
  part of:  #vessel.craft
  part:  #keel  one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability
     part:  #fin_keel__finkeel  a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability
  part:  #keelson  a longitudinal beam connected to the keel of ship to strengthen it
  part:  #rib  support resembling the rib of an animal
  part:  #rider_plate__riderplate  a horizontal beam (or plate) connected to the top of a ship's vertical keel or to the keelson

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