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Displacement

The weight of water a vessel displaces when floating, equal to the total weight of the vessel and its contents.

Displacement is the weight of water a vessel pushes aside when floating. By Archimedes' principle, this is exactly equal to the total weight of the vessel plus everything aboard. Displacement is the fundamental measure of a vessel's mass and is typically expressed in long tons, short tons, or metric tons.

In practical use: - Light displacement is the vessel empty (no fuel, water, gear, passengers). - Loaded displacement is the vessel at a standard reference load. - Displacement hulls are designed to move through the water rather than plane over it; they are fuel-efficient at moderate speeds but cannot exceed their theoretical hull speed. - Planing hulls and semi-displacement hulls use speed to lift the vessel partially out of the water.

A yacht's displacement directly affects fuel burn, hauling cost, stability, and the size of engines required.

Examples

  • A 45-foot displacement trawler might have a loaded displacement of 45,000 lbs.
  • A 45-foot planing sportfish might displace only 25,000 lbs and cruise at 28 knots.

Related Terms

Draft—The vertical distance between the waterline and the deepest point of a vessel's hull or keel.Beam—The widest measurement across a vessel's hull, perpendicular to its length.Gross Tonnage—A unitless measure of a vessel's enclosed internal volume, used for regulatory classification and licensing.Monohull—A vessel built on a single hull — the traditional design for most yachts, sailboats, and powerboats.Catamaran—A multi-hull vessel with two parallel hulls connected by a bridgedeck, valued for stability and interior space.

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