Editing Multihull (section)

===SWATH multihulls===
[[File:SWATH waterline.svg|right|thumb|A narrow waterline distinguishes a SWATH ship from a conventional [[catamaran]]]]
Multihull designs may have hull [[Beam (nautical)|beams]] that are slimmer at the water surface ("waterplane") than underwater. This arrangement allows good wave-piercing, while keeping a buoyant hydrodynamic hull beneath the waterplane. In a catamaran configuration this is called a [[Small-waterplane-area twin hull|small waterplane area twin hull]], or SWATH.<ref>{{cite book|url=https://books.google.com/books?id=8o_wCgAAQBAJ&q=SWATH&pg=PA230|title=Design Principles of Ships and Marine Structures|last=Misra|first=Suresh Chandra|date=2015|publisher=CRC Press|isbn=9781482254471|pages=474}}</ref> While SWATHs are stable in rough seas, they have the drawbacks, compared with other catamarans, of having a deeper draft, being more sensitive to loading, and requiring more power because of their  higher underwater surface areas.<ref>{{Cite web|url=https://www.chicagotribune.com/news/ct-xpm-1986-05-04-8602010405-story.html|title=Ships on Stilts|last=Kaharl|first=Victoria|date=May 4, 1986|website=chicagotribune.com|language=en-US|access-date=2019-03-25|archive-date=2019-03-25|archive-url=https://web.archive.org/web/20190325020707/https://www.chicagotribune.com/news/ct-xpm-1986-05-04-8602010405-story.html|url-status=live}}</ref> Triple-hull configurations of small waterplane area craft had been studied, but not built, as of 2008.<ref>{{Cite journal|last=Dubrovsky|first=V.|date=2008-08-22|title=An example of a triple-hull SWA ship of ultimate longitudinal shift (hull structure mass estimation)|journal=Ships and Offshore Structures|volume=3|issue=3|pages=263–265|doi=10.1080/17445300801989014|s2cid=110921016|issn=1744-5302}}</ref>