Buttock
In naval architecture, buttock is a line on a ship's hull that runs in the fore-and-aft direction and represents the intersection of the hull with a series of vertical planes parallel to the centerline. The buttock lines are used to determine the shape of the ship's hull and are typically drawn at regular intervals, such as every 5 or 10 feet. By analyzing the curvature of the buttock lines, naval architects can determine the ship's longitudinal strength, stability, and resistance to motion through the water. Additionally, the buttock lines are used to create a three-dimensional model of the ship's hull, which is essential for designing and constructing the vessel.
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