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The Hull Speed of a boat, usually referring to a displacement boat (ie, a fuel efficient or slow moving boat), is very closely approximated by the Square Root (SQRT) of the LWL (Length Water Line) multiplied by 1.34.

That is - a boat with an 81 foot waterline (about 95' overall (LOA = Length Over All)) will have a hull speed of SQRT(81) * 1.34

= 9 * 1.34

= 12.06 Nautical Miles per Hour, or "Knots".

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