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A hydrofoil is a lifting surface, or foil, that operates in water. They are similar in appearance and purpose to aerofoils used by aeroplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a hydrofoil craft gains speed, the hydrofoils lift the boat's hull out of the water, decreasing drag and allowing greater speeds.
Sailing hydrofoil. 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. A sailing hydrofoil can achieve speeds exceeding ...
Sailing hydrofoils achieve boat speeds up to twice the speed of the wind, as did the AC72 catamarans used for the 2013 America's Cup. [20] Ice boats can sail up to five times the speed of the wind. [21] [22] Lateral force is a reaction supplied by the underwater shape of a sailboat, the blades of an ice boat and the wheels of a land sailing craft.
High-performance sailing. High-performance sailing is achieved with low forward surface resistance—encountered by catamarans, sailing hydrofoils, iceboats or land sailing craft—as the sailing craft obtains motive power with its sails or aerofoils at speeds that are often faster than the wind on both upwind and downwind points of sail ...
A hydroplane (or hydro, or thunderboat) is a fast motorboat, where the hull shape is such that at speed, the weight of the boat is supported by planing forces, rather than simple buoyancy. A key aspect of hydroplanes is that they use the water they are on for lift rather than buoyancy, as well as for propulsion and steering: when travelling at ...
Armament. 1 × 76 mm (3 in)/62 Mk.75 OTO-Melara gun. 2 × quad RGM-84 Harpoon. USS Pegasus (PHM-1) was the lead ship of her class of hydrofoils operated by the United States Navy. Pegasus -class vessels were designed for high speed and mobility, and carried a powerful armament for their size.
The USS Tucumcari (PGH-2) was a Boeing -built hydrofoil. Named after Tucumcari, New Mexico, it was the basis for the technology used in the subsequent Pegasus -class patrol boats and the Jetfoil ferries. Its unique feature was a waterjet propulsion and a computer-controlled fully submerged foil configuration of one foil at the bow and foils on ...
The Pegasus-class hydrofoils were a series of fast attack patrol boats employed by the United States Navy. They were in service from 1977 until 1993. These hydrofoils carried the designation "PHM" for "Patrol Hydrofoil, Missile." The Pegasus -class vessels were originally intended for NATO operations in the North Sea and Baltic Sea.
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