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Hull Designs and Uses
Boat designs encompass a vast range depending on the specific use for which the boat is planned. Boats are basically designed in two categories: displacement hulls and planing hulls.
Displacement boats are designed to move through the water with a minimum of propulsion. They will have a large underwater profile and will ride comfortably although slowly. Trawlers and large sailboats are displacement watercraft.
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Planing boats, however, are designed to actually rise up and ride on top of the water when power is applied.
They require considerably more horsepower to get the boat up but they can attain much higher speeds from the reduced friction of moving on top of the water rather than through the water.
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Boating Basics Glossary