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Windsurfing using a board fitted with a hydrofoil. A foilboard, also known as a hydrofoil board or foil surfboard, is a type of board used in water sports; it is distinct from surfboards in that it has a hydrofoil rather than fins mounted underneath. [1]
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.
A sit-down hydrofoil. The sit-down hydrofoil, first developed in the late 1980s, is a variation on water skiing, a popular water sport.When towed at speed, by a powerful boat or some other device, the board of the hydrofoil 'flies' above the water surface and generally avoids contact with it, so the ride is largely unaffected by the wake or chop of the water and is relatively smooth.
The foil is like a wing that extends into the water under the surfboard, it causes the board to lift out of the water as it gains speed. 'Surf's up' takes on new meaning for California ...
A hydrofoil is towed water ski where the participant is seated on the ski. The ski consists of a seat tower and board, as well as a foil, which rides beneath the water’s surface, with front and rear wings. The participant straps into the hydrofoil ski and secures the safety straps on the seat tower and the foot bindings.
It generates both upward force and horizontal force which can be used for propulsion and thus moves the board across the water. The recent development of foilboards, which plane very early on a hydrofoil fin and thereby lift off the water producing low friction, represent the ideal complementary hydrodynamic platform for wings. [3]
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The board has a hydrofoil mounted in the fin box. The hydrofoil lifts the board off the water and enables the rider to achieve improved speeds in light winds due to the reduced drag. [1] [better source needed] The foil transmits a hydrodynamic lift force to the board, capable of lifting it out of the water.