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Old 01-10-2015, 01:32 PM   #9
waddenkruiser
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City: Southern Baltic
Country: Europe
Vessel Name: Sømarken
Vessel Model: AMS 40'
Join Date: Jul 2012
Posts: 187
Hull speed is matter of principle of the hydrodynamics, it's just the propagation velocity of a wave with a length equal to hulls water line LWL.

Whether it is smart to cruise at hull speed, above or below, is another question.
Cruising at SQRT(LWL) knots (LWL given in feet) which is 75% of hull speed will typically need only 25-30% of that power you would need to travel at hull speed - that will for sure save fuel.
The most fuel efficient speed of a full displacement hull is the lowest speed you can run without harming your engine.
(Different story for planning hulls...)


best regards / med venlig hilsen
wadden
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best regards / med venlig hilsen
Wadden
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