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"Hull speed" is voodoo science
Then why is the effect both predictable and
consistent? When the results of an experiment conducted a million times are identical in all regards, at what point can one draw a conclusion without being guilty of voo doo science? You could make a case that, under unique conditions, a vessel in displacement mode will attain speeds (in knots) greater than (sq rt of waterline expressed in feet) X 1.3. You can make an accurate case that the multiplier for specific hulls may vary between 1.2 and 1.4. What cannot be argued is that beyond the calculated hull speed a vessel meets the resistance of the bow wave, and must start climbing that wave (leave displacement mode) in order to increase speed. Exceptions prove the rule. If I observed that it is possible to have a rain squall pass 20 yards away and stay perfectly dry, that would neither establish that such a lucky break is a common occurence or that water isn't wet. :-) |
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