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.

Related Terms

BUMPKIN

The spar projecting from stern of ship

TRAMP FREIGHTER

A cargo ship engaged in the tramp trade.

CORDAGE

Ropes in the rigging of a ship

WEATHER SIDE

The side of a ship exposed to the wind.

MODULATING WAVE

A wave which modulates a carrier wave.

HEAVE

The oscillatory vertical rise and fall, due to the entire hull being lifted by the force of the sea. Also called HEAVING

DOGWATCH

A short, evening period of watch duty on a ship

SEA CHEST

An opening for supplying seawater to condensers, pumps, etc. located in the hull below the waterline and having means for the attachment of the associated piping

ANGSTROM UNITS

A unit of wave length, equal in length to one ten billionth.

SHELL PLATING

The plates forming the outer side and bottom skin of the hull

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