#fore-and-aft_sail  any sail not set on a yard and whose normal position is in a fore-and-aft direction
  supertype:  #sail__canvas__canvass__sheet  a large piece of fabric (as canvas) by means of which wind is used to propel a sailing vessel
  subtype:  #gaffsail__gaff-headed_sail  a quadrilateral fore-and-aft sail suspended from a gaff
  subtype:  #gaff_topsail__fore-and-aft_topsail  a triangular fore-and-aft sail with its foot along the gaff and its luff on the topmast
  subtype:  #jib  any triangular fore-and-aft sail (set forward of the foremast)
     subtype:  #flying_jib  the outermost of two or more jibs
  subtype:  #lateen_sail__lateen  a triangular fore-and-aft sail used especially in the Mediterranean
  subtype:  #lugsail__lug  a sail with four corners that is hoisted from a yard that is oblique to the mast
  subtype:  #mizzen__mizen  fore-and-aft sail set on the mizzenmast
  subtype:  #spanker  a fore-and-aft sail set on the aftermost lower mast (usually the mizzenmast) of a vessel
  subtype:  #spritsail  a fore-and-aft sail extended by a sprit
  subtype:  #staysail  a fore-and-aft sail set on a stay (as between two masts)

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