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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.
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 double and in some ...
The hull (below the water) and the sailing rig (above the water) each have drag angle with respect to the medium flowing past them (water or air), they are λ and α m in the accompanying diagram. The sum of those two drag angles are equal to β, the angle between the apparent wind and the course sailed (β = λ + α m). This theorem applies ...
Forward resistance comprises the types of drag that impede a sailboat's speed through water (or an ice boat's speed over the surface) include components of parasitic drag, consisting primarily of form drag, which arises because of the shape of the hull, and skin friction, which arises from the friction of the water (for boats) or air (for ice ...
Drag coefficients in fluids with Reynolds number approximately 10 4 [1] [2] Shapes are depicted with the same projected frontal area. In fluid dynamics, the drag coefficient (commonly denoted as: , or ) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.
The JetCycle hydrofoil lets you glide over the water while reclining in a kayak-type boat. By pedaling, the JetCycle rises up to eliminate drag from the water, pushing you faster and easier than ...
The Flyak has two hydrofoil fins below the surface of the water to create lift.At high speeds the entire hull is lifted 15 cm (5.9 in) from the water, reducing the drag and allows greater speeds – reportedly more than twice the speed of a conventional kayak.
Hydrofoils are the fastest water-based vehicles propelled solely by human power. They can reach speeds of up to 34 km/h (21 mph; 18 kn), [ 1 ] [ 2 ] [ 3 ] easily exceeding the world records set by competitive rowing which stand at about 20 km/h (12 mph; 11 kn).