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how to calculate hull speed. Maximum hull speed in knots is equal to about 13 X the square root of the waterline length of the hull in feet. P LWL05 where traditonally p 134 has been used as it matches the bow wave length to LWL.
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Plug 149 into the hull-speed formula 149 x LWL and you get a new nominal hull speed of 79 knots 149 x 529 788 as compared to the boats old nominal hull speed of 7 knots 134 x 529 708. Hull speed in knots equals 134 times the square root of the waterline length in feet HS 134 x LWL. This is a handy rule whereby boat speed in knots V is compared to hull waterline length in feet L where V divided by the square root of L the speedlength ratio or SLR.
The humps happen when waves line up and add to increase your resistance.
S 1034 WLSWLM-1034 Where S is the boat speed in knots WLM is the waterline length when moving feet. For example say you have a displacement hull with a waterline length of 25 feet then the hull speed is 5 x 13 7 knots. Velocity in knots 135 x the square root of the waterline length in feet. You can then see what effect changes to weight or power will have on top speed.
