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In page Hull (watercraft):
"S-bottom hulls are sailing boat hulls with a midships transverse half-section shaped like an s. In the s-bottom, the hull has round bilges and merges smoothly with the keel, and there are no sharp corners on the hull sides between the keel centreline and the sheer line. Boats with this hull form may have a long fixed deep keel, or a long shallow fixed keel with a centreboard swing keel inside. Ballast may be internal, external, or a combination. This hull form was most popular in the late 19th and early to mid 20th centuries.[citation needed] Examples of small sailboats that use this s-shape are the Yngling and Randmeer.
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