small waterplane-area twin hull

…Semi-submersibles (also called semi-submerged) are vessels that have a hull both above and below the waterline, like displacement vessels, but the area of ​​the part that penetrates the waterline is small, and most of the volume is separated below and above the waterline. Semi-submersible vessels with a catamaran shape below the waterline are called SWATH (short for small waterplane-area twin hull) or SSC (short for semi-submerged catamaran), and the shape below the waterline is similar to that of a body of revolution. They are found in coastal high-speed passenger ships and military boats. …

*Some of the terminology that refers to "small waterplane-area twin hull" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…半潜水型(半没水型ともいう)は，排水量型と同様船体は水面下と水面上にあるが，水面を貫通する部分の面積が小さく，容積の大部分が水面下と水面上に分離しているものをいう。水面下を双胴船の形とした半潜水型船型は，SWATH（スワツス）船型(small waterplane‐area twin hullの略)，またはSSC船型(semi‐submerged catamaranの略)と呼ばれ，水面下の形状は回転体に近い。近海高速旅客船や軍用艇に見られる。…

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出典｜株式会社平凡社世界大百科事典 第２版について | 情報