Class of two; Helgoland and Borkum
SWATH = Small Waterplane Area Twin Hull
Gets almost all its buoyancy from two submerged, torpedo-like hulls. Narrow struts support the upper hull / superstructure. Submerged hulls and small waterplane area leads to exceptional sea-keeping qualities.
For reference, check out this website:
http://www.maritimejournal.com/news101/ ... -swath-duo
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