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circular arc hull
The circular arc hull is a design for boat hulls created by Swedish engineer Fredrik Ljungström. In the 1930s and 1940s Ljungström designed and built sailboats, commonly called the Ljungstrom sailboat.
== Ribs ==
The frames, or ribs, of a circular arc hull all have the same radius. On Ljungström's first models, frames were a cross-section (a single arc), but he soon realized that he needed a slightly narrower profile to cope with the sea. The result was that two arcs met at the bottom so that a slightly pointed bottom was created. The frames are tilted toward the mast so that the stern and bow lean while standing straight up.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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