Hull speed

The hull speed is the maximum speed that a displacement hull can achieve. The hull speed in knots is approximately equal to the square root of the waterline length in feet, times 1.34, or

$1.34*{\sqrt {(}}length)$

This relationship is based upon the physics equations of wave motion, where the hull speed is equal to the square root of the acceleration of gravity (9.80665 m/s^2) times the waterline length divided by two*pi.