Definition
Approximated by 1.34 multiplied by the square root of the waterline length in feet, or 2.43 times the square root of the length in metres, giving speed in knots. A 30 foot waterline yields about 7.3 knots. It marks where the wave the hull generates has a length equal to the hull and drag rises steeply. Light displacement and planing hulls exceed it readily, so treat it as a guide rather than a barrier.
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