Editing Yacht (section)

===Hulls===
There are three basic types of motor yacht hull: {{em|full-displacement}}, {{em|semi-displacement}}, and {{em|planing}}, which have progressively higher cruise speeds and hourly fuel consumption with increased engine power:<ref name="powerandmotoryacht.com">{{cite news|url=http://www.powerandmotoryacht.com/design/understanding-hull-design|title=Understanding Hull Design|last=Thiel|first=Richard|date=May 2013|website=Power & Motoryacht|access-date=2020-04-23}}</ref>

* ''Full-displacement hulls'' move the water up and out of the way of the vessel, making a wave. They are limited in speed by the square root of the waterline length multiplied by a factor, depending on the units used. Added horsepower cannot increase the maximum speed, only the size of the waves produced. 
* ''Semi-displacement hulls'' allow speeds that are faster than the [[hull speed]] of a displacement vessel because they rise somewhat out of the water and create smaller waves. They also provide greater comfort than planing hulls.
* ''Planing hulls'' require sufficient power for the boat to slide up onto the surface, which avoids the need to use power to lift water out of the way of the vessel. Such vessels have flat surfaces on the undersides.

A typical semi-displacement yacht has a wedge-shaped bow, which promotes penetrating waves, that transitions to flatter, wider surfaces aft, which promotes lifting the vessel out of the water—the "deep vee" hull, designed by Ray Hunt, found in approximately 75% of modern power boats.<ref>{{Cite news|url=https://www.powerandmotoryacht.com/boat-design/the-basics-of-hull-design-explained|title=The Basics of Hull Design Explained|last=Prince|first=Bill|date=June 2019|website=Power & Motoryacht|language=en-us|access-date=2020-04-23}}</ref>

Cruising motor yachts are available in a range of styles as two-engine {{em|catamarans}}, ranging in length from {{Convert|40-150|ft|m}} with top speeds ranging from {{Convert|20-60|kn|km/h}}.<ref>{{Cite web|url=https://uk.boats.com/reviews/best-multihull-powerboats/|title=Best multihull powerboats - boats.com|last=Smith|first=Alex|date=February 12, 2018|website=Boats.com|access-date=2020-04-24}}</ref>