Principle Dimensions of a ship


  • LOA : Length Overall (LOA)is the length measured between  the extreme  ends of the ship from forward  to aft.
  • LWL : Length  at waterline (LWL) is the length measured at the existing waterline, from forward to aft ends of the ship. It varies with the draft  of the ship.
  • LBP : Length between perpendicular(LBP) is the length measured between the FP and AP of the ship. It is used in stability  calculations.
  • SLWL : Summer Load Waterline  (SLWL) is the waterline at which the ship is floating at even keel upto the summer  load line in salt water of RD 1.025.
  • FP : Forward perpendicular  (FP) is a vertical  line passing  through the intersection  of the SLWL and the fore side of the stem of the ship.
  • AP : Aft perpendicular (AP) is the vertical line passing through the intersection  of the SLWL and aft side of the rudder post or the center of the rudder stock, if rudder post is not fitted. 
  • Midshipman : Midshipman or amidships is the vertical line passing through the midpoint of the LBP.

  • Breadth : Extreme breadth is the maximum breadth measured between the  outside of the shipsides. Moulded breadth is the maximum breadth measured at midshipman between  the inner sides of ship side plating.
  • Depth : Extreme depth is the maximum depth measured along the centreline of the ship from the bottom of the keel to the top of the uppermost deck.
  • Draft : Draft is the vertical  distance  measured  along the shipside from the bottom of the keel to the waterline.

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