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Hydrofoiling wingsail catamaran 17. A sailing hydrofoil, hydrofoil sailboat, or hydrosail is a sailboat with wing-like foils mounted under the hull.As the craft increases its speed the hydrofoils lift the hull up and out of the water, greatly reducing wetted area, resulting in decreased drag and increased speed.
This boat was designed by Comte de Lambert. [8] This had 5 variable pitch fins on the hull beneath the water so inclined that when the boat begins to move "the boat rises and the planes come to the surface" with the result that "it skims over the surface with little but the propellers beneath the surface".
Tacking or coming about is a sailing maneuver by which a sailing craft (sailing vessel, ice boat, or land yacht), whose next destination is into the wind, turns its bow toward and through the wind so that the direction from which the wind blows changes from one side of the boat to the other, allowing progress in the desired direction. [1]
A (floating) bucket tied to the end of the line works as a basic sea anchor. In The Sea-Wolf, author and sailor Jack London described using various broken spars and sails, tied to a line, as an improvised sea anchor. [2] A sail, weighed down with an anchor chain or other heavy object, will also work as an improvised sea anchor. [3]
Shot buoys mark dive sites for the boat safety cover of scuba divers so they can descend to dive sites more easily in conditions of low visibility or tidal currents and more safely do decompression stops on their ascents. Surface marker buoys are taken on dives by scuba divers to mark their positions underwater. [15]
This is done to keep more weight in the back of the boat and make the wake larger. Some wakeboard specific boat models are direct drive boats where the engine is in the middle of the boat. Most wakeboard boats will have several features that help to create large wakes. These include ballast, [1] hydrofoil, and hull technology. Ballast is a ...
Cross section of a vessel with a single ballast tank at the bottom. A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural ...
Marine steam reciprocating engines, ca. 1905 A wind propelled fishing boat in Mozambique. Until the application of the coal-fired steam engine to ships in the early 19th century, oars or the wind were the principal means of watercraft propulsion.