A form of high-speed ship that supports its weight by means of wings (properly called hydrofoils, or simply foils) beneath the surface of the water. The hydrofoils generate lift by movement in the same manner as an airplane wing. The hydrofoil was conceived in order to produce faster ships. The most effective means of developing a faster ship is to find a way to lift the hull clear of the water. This greatly reduces the drag on the hull, in turn greatly reducing the power required to drive the ship. The hydrofoil ship is one means to this end.