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A medieval sailing ship would rarely if ever exceed its hull speed. Hull speed in knots is approximately 1.34 times the square root of the vessel's waterline length in feet. A vessel with a waterline lenght of 50 feet would have a hull speed of 9.34 knots A vessel with a waterline length of 100 feet would have a hull speed of 13.5 knots. Most of the time they would go more slowly than this, maybe 5-8 knots in "normal" conditions. In given conditions some ships would go faster than others depending on a number of factors including hull shape, rig, fouling, windage etc.

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17y ago

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