A small waterplane area twin hull better known by the acronym swath is a twin hull ship design that minimizes hull cross section area at the seas surface minimizing the ships volume near the surface area of the sea where wave energy is located maximizes a vessels stability even in high seas and at high speeds the bulk of the . For this reason sis tri hull small waterplane area ship designs dont have 3 geometrically similar hulls instead the designs have a small waterplane area centerhull with 80 to 90 percent of the total displaced volume and 2 relatively short slender vertical struts providing the rest of the buoyancy. Swash small waterplane area single hulled boats and ships united nations solas ais automatic identification system collision avoidance system cas super ais and the snav satellite navigation system. Swath ships typically have two submarine like lower hulls completely submerged below the water surface above water a swath resembles a catamaran however the purpose for a balanced small waterplane twin hull ship design is not to minimize ship motions at the expense of speed power or payload capabilities
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