Bottom pressure on planning hulls

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Many forms of marine transport make use of planing, including fast ferries , racing boats, floatplanes , flying boats , and seaplanes. Most surfboards are planing or semi-planing hulls. Beyond planing, fast vessel designs have seen a transition to hydrofoil designs. The earliest documented planing sailboat was a proa built in by Commodore Ralph Munroe.
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Planing hull

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* Planing hull (Boating) - Definition,meaning - Online Encyclopedia

In basic terms it displaces the same amount of water when stationary or moving, it is supported by buoyancy and they are typically big, round and bulbous. Generally displacement hulls are slow, as they are not designed to naturally plan, the speed at which they move through the water is limited by its waterline length. Semi displacement hulls are normally a cross between a planning and displacement hull, they will generate an amount of lift but the vessels weight will be supported by buoyancy. A semi displacement hull creates a big whole in the water which generate large bow and stern waves. Semi displacement hulls will typically have a similar hull shape to displacement hull but will flatten off towards the stern.
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How different hull types react in rough water

I know the 3 different types of hulls, Displacement, Semi-displacement and Planing hulls. I know that Displacement hulls go through the water, and Planing hulls go over the top of the water, so what the best description for a Semi-Displacement hull??? Does the hull and the engine of a Semi-displacement take more abuse? Does the engine need to work harder as its got more boat in the water than a planing boat?
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As part of my research for a story I was writing, I once asked a fellow marine writer, who was also a well-known naval architect, to explain the basics of hull design. His answer was short and pithy. A layman could easily spend hours, if not days and years, poring over textbooks and tomes that explain such arcane at least to the average boater concepts as warp and prismatic coefficient.
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