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  2. Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well.
    en.wikipedia.org/wiki/Hull_speed
    Hull speed is the speed at which a vessel with a displacement hull must travel for its waterline to be equal to its bow wave's wavelength. A displacement hull travels through water, instead of on top of it as a planing hull (like a kiteboard) would, thereby displacing water with its buoyancy as it sails.
    www.omnicalculator.com/sports/hull-speed
     
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    What is hull speed?Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well.
    en.wikipedia.org
    How fast can a displacement hull travel?Displacement hulls are designed to be slower than other types of vessels, and their speed is limited by the laws of physics. Generally, displacement hulls can only travel at speeds that are equal to or below their displacement speed, also known as their “hull speed”.
    When does a boat travel at hull speed?When the wavelength meets the waterline length (that's also when the bow wave's first and second crests are at opposite tips of the waterline), the boat is said to be traveling at hull speed. Take a look at the picture below to see what we mean: The bow wave's wavelength increases as the boat's speed does.
    omnicalculator.com
    How is hull speed calculated?The hull speed of a boat is calculated using a formula involving the square root of the waterline length. Doubling a boat's waterline length will only increase its hull speed by 40%. Wave interference at speeds exceeding the hull speed causes increased drag, greater fuel consumption, and reduced stability.
     
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    Hull speed - Wikipedia

    Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well. When hull speed … See more

    As a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically in full-formed hulls at a Froude number of about 0.35 (which corresponds to a speed/length ratio (see below for … See more

    Wave-making resistance depends on the proportions and shape of the hull: many modern displacement designs can exceed their hull speed even without planing. These include hulls … See more

    Hull speed can be calculated by the following formula:
    $${\displaystyle v_{hull}\approx 1.34\times {\sqrt {L_{WL}}}}$$ See more

    Because the hull speed is related to the length of the boat and the wavelength of the wave it produces as it moves through water, there is … See more

     
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    WEBFeb 27, 2024 · The hull speed can be further mathematically expressed as: 1.34 times the square root of the vessel’s length, simplifying the above terms and replacing the wave speed term with the given vessel’s speed …

  8. Understanding Hullspeed and the Speed/Length Ratio …

    WEBMaximum hull speed (in knots) = 1.34 x the square root of the waterline length (in feet) These figures relate to a boat in displacement mode. If sufficient power can be applied to overcome hull drag and enable the …

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