Hull Speed Chart
Displacement hull speed is an important indicator of how fast a displacement-type boat will go. It is the speed at which a boat begins to climb it's own bow wave, essentially going uphill. Theoretical displacement hull speed is calculated by the formula: velocity in knots = 1.35 x the square root of the waterline length in feet.
I got tired of looking around for my calculator, so I made up this handy chart. Since I usually think in terms of statute mph, I included that too. I also included kilometers per hour. (Note that this hull speed formula does not apply to needle-like hulls such as racing shells).