Line where the hull of a ship meets the surface of the water
"Plimsoll line" redirects here. For the use of the Plimsoll symbol in chemistry, see Standard state.
For other uses, see Waterline (disambiguation).
Load line mark and lines on the hull of a ship
The waterline is the line where the hull of a ship meets the surface of the water. Specifically, it is also the name of a special marking, also known as an international load line or Plimsoll line (positioned amidships), that indicates the draft of the ship and the legal limit to which a ship may be loaded for specific water types and temperatures in order to safely maintain buoyancy,[1] particularly with regard to the hazard of waves that may arise. Varying water temperatures will affect a ship's draft, because warm water is less dense than cold water, providing less buoyancy. In the same way, fresh water is less dense than salinated or seawater with a similar lessening effect upon buoyancy.
For vessels with displacement hulls, the hull speed is defined by, among other things, the waterline length. In a sailing boat, the waterline length can change significantly as the boat heels, and can dynamically affect the speed of the boat.
A waterline can also refer to any line on a ship's hull that is parallel to the water's surface when the ship is afloat in a level trimmed position. Hence, waterlines are a class of "ships lines" used to denote the shape of a hull in naval architecture lines plans.
In aircraft design, the term "waterline" refers to the vertical location of items on the aircraft. This is (normally) the Z axis of an X × Y × Z coordinate system, the other two axes being the fuselage station (X) and buttock line (Y).[citation needed]
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The waterline is the line where the hull of a ship meets the surface of the water. Specifically, it is also the name of a special marking, also known...
length at the waterline (abbreviated to L.W.L) is the length of a ship or boat at the level where it sits in the water (the waterline). The LWL will...
The Dutch Waterline (Dutch: Hollandsche Waterlinie, modern spelling: Hollandse Waterlinie) was a series of water-based defences conceived by Maurice of...
"Down to the Waterline" is a 1978 song written by Mark Knopfler and first released by Dire Straits as the first song on their debut album, Dire Straits...
The Frisian waterline started being built around 1580. The defence line goes from the Zuidersea, along the River Linde, to the De Blesse Bridge. Then...
Walking to the Waterline is a 1998 American drama film written and directed by Matt Mulhern and starring Matt Mulhern, Alan Ruck, Matthew Broderick, and...
of the waterline beam measurement is called 4" waterline, where the displacement is taken into account. This measurement is done at the waterline level...
oa) is the maximum length of a vessel's hull measured parallel to the waterline. This length is important while docking the ship. It is the most commonly...
The West Brabant waterline (Dutch: West-Brabantse waterlinie) (later: Stelling West Noord-Brabant) is a Dutch military defense line based on inundation...
(Gyrinidae), where they are split to allow a view both above and below the waterline. A few Longhorn beetles (Cerambycidae) and weevils as well as some fireflies...
flaring or protruding bulb at the bow (or front) of a ship just below the waterline. The flare or bulb modifies the way the water flows around the hull, reducing...
bath. G Deck, the lower deck, had the lowest portholes, just above the waterline. The first-class squash court was located here along with the travelling...
single, "Sultans of Swing", as well as "Water of Love" and "Down to the Waterline". After a performance at the Rock Garden in 1977, they took a demo tape...
on fifteen passenger decks. The vessel also has 4 crew decks below the waterline. Freedom of the Seas was the largest passenger ship ever built (by gross...
side, and none below the waterline." The expedition found no penetrations in the main armoured belt, above or below the waterline. The examiners noted several...
battleship that day to suffer catastrophic damage to her belt armor at the waterline from a torpedo. Admiral Chester Nimitz, in a report to Congress, confirmed...
foot (4 m2) retractable fins that extended out from midship below the waterline, which helped balance out the ship after missile launches. Her hull classification...
{\mbox{knots}}\approx 2.5\times {\sqrt {L{\mbox{m}}}}} where L is the length of the waterline in feet or meters. When the vessel exceeds a speed/length ratio of 0.94...
Titanic collided with an iceberg, damaging the hull's plates below the waterline on the starboard side, causing the front compartments to flood. The ship...
ship's waterline. In theory this belt would absorb the explosions from torpedoes, or any naval artillery shells that struck below the waterline, and thus...
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