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Royal Navy World War II motor torpedo boat planing at speed on calm water showing its hard chine hull - note how most of the forepart of the boat is out of the water. At rest, a vessel's weight is borne entirely by the buoyant force. Every hull acts as a displacement hull at low speeds: the buoyant force is mainly responsible for supporting the ...
Such hull forms are commonly used by canoes, competitive rowing boats, catamarans, and fast ferries. For example, racing kayaks can exceed hull speed by more than 100% even though they do not plane. Heavy boats with hulls designed for planing generally cannot exceed hull speed without planing. Ultra light displacement boats are designed to ...
Planing hulls and other highspeed hulls tend towards a higher C p. Efficient displacement hulls travelling at a low Froude number will tend to have a low C p. = Waterplane coefficient (C w) is the waterplane area divided by L WL x B WL. The waterplane coefficient expresses the fullness of the waterplane, or the ratio of the waterplane area to a ...
A graph showing resistance–weight ratio as a function of speed–length ratio for displacement, semi-displacement, and planing hulls. Since semi-displacement and planing hulls generate a significant amount of lift in operation, they are capable of breaking the barrier of the wave propagation speed and operating in realms of much lower drag ...
Displacement hulls - Monohull boats frequently ride deeply in the water, this is known as a displacement hull. Planing hulls - Hulls that ride on top of the water are called planing hulls, because when they reach speed, the hulls are substantially lifted above the water; this is known as planing (to plane).
In the case of planing craft, where the waterline length is too speed-dependent to be meaningful, the Froude number is best defined as displacement Froude number and the reference length is taken as the cubic root of the volumetric displacement of the hull: =.
Such a hull has a maximum "hull speed" which is a function of its waterline length. An exception is the catamaran, whose twin hulls are usually so fine that they do not engender a bow wave. Planing hulls: planing hulls have a shape that allows the boat to rise out of the water as the speed increases. Sail boats that plane are typical V-shaped ...
A padded V-hull is a hull shape found on both pure race boats and standard recreational craft. A variation of the more common V-hull , which has a V-section throughout the length of the vessel, a padded V-hull has a V-section at the bows and the forward part of the keel which then segues into a flat area typically 0.15 metres (5.9 in) to 0.25 ...