Hydrofoil
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A hydrofoil is a lifting surface, or foil, that operates in water. It is similar in appearance and purpose to aerofoils used by airplanes. Boats that use hydrofoil technology are also simply termed hy
Forlanini's hydrofoil over Lake Maggiore, 1906
Alexander Graham Bell's HD-4 on a test run, c. 1919
Meteor
Raketa
Airfoil
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An airfoil or aerofoil is a streamlined body that is capable of generating significantly more lift than drag. Wings, sails and propeller blades are examples of airfoils. Foils which work in a similar
Hydrofoil
…A hydrofoil is a lifting surface, or foil, that operates in water. It is similar in appearance and purpose to aerofoils used by airplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a craft gains speed, the hydrofoils lift the boat's hull…
Lift and drag curves for a typical airfoil
An airfoil section is displayed at the tip of this Denney Kitfox aircraft, built in 1991.
Airfoil profile of a Kamov Ka-26 helicopter's lower rotor blade