Length between Perpendiculars:Īs the name suggests, the length between perpendiculars is the length between the aft and forward perpendiculars. It is used as the aft reference line in all hydrostatic calculations. It may either be the perpendicular drawn through the center-line of the rudder pintles or the one through the aft side of the rudder post. The exact definition of the aft perpendicular can depend on the specific ship designed. It is commonly used as the forward reference of the ship’s hull in the majority of the hydrostatic calculations. The forward perpendicular can be defined as an imaginary perpendicular drawn at the point where the waterline and bow intersect. More specifically, the bow’s forwardmost contour is called the stem. The bow is the hull’s forwardmost contour, while its aft-most is referred to as the stern. The following is a condensed list of hull-related nomenclature, providing an overview of the words and phrases you can expect to see regularly used about hull design: Bow and Stern:
Understanding the basic functions of a ship’s hull and the terms used in discussing its characteristics is a necessity before its role in boat stability design can be fully comprehended. The Basics of Ship Hull Design ExplainedĬomposed of a complex assortment of parts, the hull of a vessel incorporates many aspects of shipbuilding technology.
Beyond its core function, the hull is designed for numerous other factors that will come into play over the full length of a vessel’s lifetime. However, this definition alone is a significant oversimplification that would reduce our understanding of the many aspects of a ship’s hull considerably. Its most basic purpose is to safeguard against weather, flooding, and/or structural damage. The hull is a ship’s watertight enclosure, engineered to provide sufficient protection for the cargo, machinery, and passenger accommodations. A vessel’s entire design and construction is centered on the hull. As a vessel’s most vital structural entity, the hull is precisely designed to fulfill a diverse range of requirements throughout the life of a ship.
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