Length, breadth and depth of Ship

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Scantling Length (L)

L is the distance in meters (feet) on the summer load line from the fore side of the stem to the centerline of the rudder stock. For use with the Rules, L is not to be less than 96% and need not be greater than 97% of the extreme length on the summer load line. The forward end of L is to coincide with the fore side of the stem on the waterline on which L is measured.

Freeboard Length (Lf)

Lf is the distance in meters (feet) on a waterline at 85% of the least molded depth measured from the top of the keel from the fore side of the stem to the centerline of the rudder stock or 96% of the length on that waterline, whichever is greater. Where the stem is a fair concave curve above the waterline at 85% of the least molded depth and where the aftermost point of the stem is above the waterline, the forward end of the length, Lf, is to be taken at the aftermost point of the stem above that waterline.
In ships designed with a raked keel, the waterline on which this length is measured is to be parallel to the designed waterline.

Breadth (B)

B is the greatest molded breadth in meters (feet).

Depth

Molded Depth (D)

D is the molded depth at side in meters (feet) measured at the middle of L from the molded base line to the top of the freeboard-deck beams. In vessels having rounded gunwales, D is to be measured to the point of intersection of the molded lines of the deck and side shell plating. In cases where watertight bulkheads extend to a deck above the freeboard deck and are to be recorded in the Record as effective to that deck, D is to be measured to the bulkhead deck.

Scantling Depth (Ds)

The depth Ds for use with scantling requirements is the distance in meters (feet) from the molded base line to the strength deck.

Draft (d)

d is the molded draft, and is the distance in meters (feet) from the molded base line to the summer load line.

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