Re: Someone please educate me
Hull Types <br /> <br /><br /><br />Boats perform in the water based on the physical shape of the hull, and how it sits in the water. The two extremes of hull designs are displacement hulls and planing hulls. Between these extremes are designs referred to as semi-displacement and semi-planing hulls. <br /><br /><br />Displacement Hull<br />Displacement hulls push through the water as they have no hydrodynamic lift, or the boat does not rise out of the water as speed increases. The maximum speed of these hulls is between 1 and 1.5 times the square root of the boat length based on hull design. <br /><br /><br />Planing Hull<br />Planing hulls typically have a flat bottom, and are designed to run on top of the water at high speeds. The hull design (shape) does not limit the maximum attainable speed. Few boats have true planing hulls. <br /><br /><br />Semi-displacement / Semi-planing Hulls<br />Semi-displacement or semi-planing hulls have features of both planing and displacement hulls. They have a maximum hull design speed. Exceeding this speed can result in erratic handling and unstable operation. There is not one hull design characteristic that differentiates semi-displacement from semi-planing hull. The greater the hydrodynamic lift and higher the hull design speed the more likely it will be referred to as a semi-planing hull.
