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An angled change in the underwater longitudinal profile of a vessel between the bow and keel or between the stern and keel. Sometimes called cut up.



Related Terms

BOW AND STERN LINES

The lines led forward from the bow and aft from the stern when a vessel is moored to the dock.

CLOSE COUPLED TOWING

A method of towing vessels through polar ice by means of icebreaking tugs with a special stern notch suited to receive and hold the bow of the vessel to be towed

LENGTH OVERALL

The linear measurement of a vessel from bow to stern

LPP

The length of a vessel along the waterline from the forward surface of the stem, or main bow perpendicular member, to the after surface of the sternpost, or main stern perpendicular member. Believed to give a reasonable idea of the vessel's carrying capacity, as it excludes the small, often unusable volume contained in her overhanging ends.

SAGGING

Straining of the ship that tends to make the middle portion lower than the bow and stern (See hogging)

HOGGING

When the peak of a wave is amidships, causing the hull to bend so the ends of the keel are lower than the middle. The opposite of sagging. Also refers to a permanent distortion of the hull in the same manner caused, over time, by the bow and stern of a ship being less buoyant than the midships section. During the Age of Sail, shipwrights employed a number of different designs of braces to stiffen ships' hulls against this warping.

SHEER

The longitudinal curve of a vessel's decks in a vertical plane. Due to sheer, a vessel's deck height above the baseline is higher at the stem and stern than at amidships

LENGTH BPP

The length of a vessel along the waterline from the forward surface of the stem, or main bow perpendicular member, to the after surface of the sternpost, or main stern perpendicular member. Believed to give a reasonable idea of the vessel's carrying capacity, as it excludes the small, often unusable volume contained in her overhanging ends.

DRAFT MARKS

The numbers which are placed on each side of a ship at the bow and stern from the lower edge of the number to the bottom of the keel

RABET

In timber construction, the shaped rebate along the longitudinal backbone of a vessel to receive the square edge of the planks. In ship design and construction, the line of the outside of the planking and the side/face of the stem, keel, after deadwood and stern post. See Bearding line.

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