/huy"dreuh foyl'/, n.
1. Naval Archit. a surface form creating a thrust against water in a direction perpendicular to the plane approximated by the surface.
2. Naut.
a. a winglike member having this form, designed to lift the hull of a moving vessel.
b. a vessel equipped with hydrofoils.
[1915-20; HYDRO-1 + FOIL2]

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      underwater fin with a flat or curved winglike surface that is designed to lift a moving boat or ship by means of the reaction upon its surface from the water through which it moves. Ships that use hydrofoils, or foils, are themselves called hydrofoils. Hydrofoils can lift a boat's hull clear of the water as speed increases, and the resultant reduction in drag yields higher speeds without expending more horsepower.

      The two main foil systems now in use are the surface-piercing and submerged types. Surface-piercing foils just break the surface of the water and are usually arranged in a V-shape. Foils that stay fully submerged project down into the water vertically. When at rest or steaming slowly, a hydrofoil ship supports its weight by its own buoyance, but as speed is increased, the foils carry progressively more weight until the ship's hull is raised clear of the water. Hydrofoil ships are faster than ships of conventional design but are limited to moderate sizes.

      The first efficient manned hydrofoil ship was built in Italy about 1900 by Enrico Forlanini. Hydrofoils were not widely used until the 1950s, when military and commercial models were built. By the 1970s hydrofoil craft were in operation in many places, and speeds of up to 80 knots (nautical miles per hour) had been achieved.

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Universalium. 2010.

Look at other dictionaries:

  • hydrofoil — [ idrofɔjl ] n. m. • 1955; mot angl. , de foil « feuille, surface plane » ♦ Anglic. Navire rapide dont la coque, munie d ailes portantes, se soulève hors de l eau à grande vitesse. Recomm. offic. HYDROPTÈRE. ● hydroptère ou hydrofoil nom masculin …   Encyclopédie Universelle

  • hydrofoil — 1959, boat that travels through water on wings, short for hydrofoil boat, originally the name of the wings themselves (1920); formed in English from HYDRO (Cf. hydro ) + FOIL (Cf. foil) (n.) …   Etymology dictionary

  • hydrofoil — s. m. 1. Estrutura na parte inferior de uma embarcação, semelhante a uns patins ou planadores, sustentados por uma espécie de braços, para reduzir o atrito com a água. 2. Embarcação rápida, a motor, cujo casco é provido dessa estrutura. •… …   Dicionário da Língua Portuguesa

  • hydrofoil — ► NOUN 1) a boat fitted with structures (known as foils) which lift the hull clear of the water at speed. 2) each of the foils of such a craft …   English terms dictionary

  • hydrofoil — [hī′drə foil΄] n. [ HYDRO + (AIR)FOIL] 1. any of the winglike structures attached to the hull of some watercraft: at a certain speed the hull is lifted above the water and the craft skims along on the hydrofoils at great speeds 2. a craft with… …   English World dictionary

  • Hydrofoil — A hydrofoil is a boat with wing like foils mounted on struts below the hull. As the craft increases its speed the hydrofoils develop enough lift for the boat to become foilborne i.e. to raise the hull up and out of the water. This results in a… …   Wikipedia

  • Hydrofoil — Hydroptère Pour les articles homonymes, voir Hydroptère (homonymie). Prototype Forlanini 1910 Un hydroptère (d …   Wikipédia en Français

  • Hydrofoil — Hy|d|ro|foil [ haɪdrəfɔɪl], das; s, s [engl. hydrofoil, geb. nach aerofoil = Tragfläche, flügel]: engl. Bez. für: Tragflächen , Tragflügelboot. * * * Hydrofoil   [ haɪdrəʊfɔɪl] das, (s)/ s, englische Bezeichnung für Tragflügelboot. * * *… …   Universal-Lexikon

  • hydrofoil — UK [ˈhaɪdrəʊˌfɔɪl] / US [ˈhaɪdrəˌfɔɪl] noun [countable] Word forms hydrofoil : singular hydrofoil plural hydrofoils a) a boat with wing shaped pieces fixed to the bottom that lift the boat onto the surface of the water as it starts to travel… …   English dictionary

  • Hydrofoil — Hy|dro|foil [ haidroufɔil] das; [s], s <aus gleichbed. engl. hydrofoil> engl. Bez. für Tragflächenboot …   Das große Fremdwörterbuch

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