hydrofoil

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hydrofoil

The hydrofoil glides swiftly across the calm bay.

Definition

Noun 1. A speedboat equipped with wing-like structures (foils) that lift the hull out of the water at high speed. This type of vessel is designed for reduced water resistance and higher speed. 2. A wing-like structure or foil designed to provide lift in water. This is the specific device that, when moved through water, generates an upward force to lift a vessel's hull.

Usage Examples
  • Noun (Type of Boat):
    • The hydrofoil crossed the harbor in half the time of a conventional ferry.
    • We took a hydrofoil to the island to avoid the rough sea.
  • Noun (Lifting Device):
    • A broken hydrofoil can cause the boat to lose stability.
    • The engineer studied the design of the hydrofoil to improve its efficiency.
Advanced Usage
  • Technical Context: In naval architecture, a hydrofoil operates on the same principle as an airplane wing (an airfoil), but in water. Lift is generated by the pressure difference between the upper and lower surfaces of the foil as it moves.
  • "Foil-borne" vs. "Hull-borne": These terms describe the operational states of a hydrofoil vessel. A boat is when lifted by its hydrofoils and when resting on the water.
Variants and Related Words
  • Hydroplaning (noun): A related but distinct phenomenon where a vehicle (like a car or boat) slides on a thin film of water, losing traction. (Note: This is not a variant of "hydrofoil" but a commonly confused term).
  • Foil (noun): The general term for a wing-like structure designed to provide lift, used in both air (airfoil) and water (hydrofoil).
Synonyms
  • For the boat: Foilborne craft, hydrofoil craft.
  • For the device: Lifting foil, underwater wing.
Related Phrases
  • "On the foils": A phrase describing a hydrofoil vessel that is successfully lifted out of the water and traveling on its hydrofoils.
    • Once the boat reached 20 knots, it was up on the foils and the ride smoothed out.
hydrofoil

The hydrofoil glides swiftly across the calm bay.

Noun
  1. a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds
    • the museum houses a replica of the jet hydroplane that broke the record
  2. a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through
    • the fins of a fish act as hydrofoils

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