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Ship Construction Chp. 2
Terms in this set (30)
froward perpendicular (FP)
a perpendicular drawn to the waterline at the point where the fore-side of the stem meets the summer load line.
length between perpendicular (LBP)
the length between the forward and aft perpendiculars measured along the summer load line. q
length overall (LOA)
length of vessel over all extremities
used for obtaining scantlings if the vessel is classed with Lloyd's Register. Same as the length between perpendiculars but must not be less than 96% and be more than 97% of the extreme length of the summer load line.
the length of the ship measured from the fore-side of the head of the stem to the aft side of the head of the stern post or the fore-side of the rudder stock.
96% of the total length on a waterline at 85% of the least molded depth measured from the top of the keel, or the length from the foreside of the stem to the axis of the rudder stock on the waterline.
a horizontal line drawn at the top of the keel plate. all vertical molded dimensions are measured relative to this line.
measured at the midship section, this is the max molded breadth of the ship
measured from the base line to the summer load line at the midship section
measured from the base line to the heel of the upper deck beam at the ships side amidships
the max beam taken over all extremities
taken from the lowest point of the keel to the summer load line. draft marks represent extreme drafts
depth of vessel at ships side from upper deck to lowest point of the keel
since a ship's hull is symmetrical along the longitudinal center line, often only the half beam or half breadth at any section is given
vertical distance measured at the ship's side between the summer load line and the deck.
a rise in the height of the deck (curvature or straight line) in the longitudinal direction. Measured as the height of the deck at any point above the side amidships
camber (round of beam)
curvature of decks in the transverse direction. measured as the height of the deck at the center
rise of floor (dead rise)
the rise of the bottom shell plating line above the base line. This rise is measured at the line of the molded beam
half siding of keel
the horizontal flat portion of the bottom shell measured to port or starboard of the ship's longitudinal center line. (useful dimension for dry docking)
the inward curvature of the side shell above the summer load line. this is unusual on modern ships
the outward curvature of the side shell above the waterline. it promotes dryness and is therefore associated with the fore end of the ship
inclination of the stem line from the vertical
inclination of the keel line from the horizontal. trawlers and tugs often have keels raked aft to give greater depth aft where the propeller diameter is larger on this type of vessel
tween deck height
vertical distance between adjacent decks measured from the tops of deck beams at ship's side
parallel middle body
the length over which the midship section remains constant in area and shape
the immersed body of the vessel forward of the parallel middle body
the immersed body of the vessel aft of the parallel middle body
a measure of the enclosed internal volume of the vessel
Ultra Large Crude Carriers (300 000 - 550 000 tonnes deadweight)
Very Large Crude Carrier (200 000 - 300 000 tonnes deadweight)
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