From the 1960's and into the 1990's the US Navy experimented with Hydrofoil technology creating prototypes and operational "Ships That Fly". Beginning with the USS HIGHPOINT in 1962, followed by the Grumman built USS FLAGSTAFF and Boeing built USS TUCUMAN which were both extensively field tested in Vietnam and with NATO forces in Europe, and finally the huge Grumman/Lockheed built USS PLAINVIEW.
These vessels would "fly" above the sea, with water flowing over submerged foils like air flowing over airplane wings. The hydrofoil depended on forward speed to generate lift on its underwater wings, much like an airplane flying through the air. Hydrofoil patrol boats had several advantages over traditional hulls. The underwater wings lifted the hull out of the water, reducing drag. Hydrofoil boats' small submerged area reduced risk of torpedo attacks. The underwater wings increased stability, enabling hydrofoils to maneuver in rough water
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