A curved keel shape that is lower in the middle than the ends, facilitating tacking.

Related Terms


On the beam, a relative bearing at right angles to the ship's keel.


A downward projecting ridge on the underside of the ICE CANOPY, the counterpart of a RIDGE. An ice keel may extend as much as 50 meters below sea level.


Laying the keel of a ship in a shipyard to begin her construction.


A punishment by dragging under keel of ship.


The design angle of the hull at the keel relative to horizontal when viewing the cross section, or the distance of rise from the keel to a defined point on the hull.


A maritime punishment: to punish by dragging under the keel of a ship.


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.


The strake closest to the keel.


The depth of a ship's keel below the waterline.


The central structural basis of the hull.

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