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Wayne.B
 
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On 12 Apr 2005 11:46:08 -0700, (Matteo) wrote:

I'm thinging of dirty hull (green slime), incorrect weight
distribution (bow tends to "point" upwards even when crossing small
waves).


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A dirty bottom and/or dirty props will definitely slow you down. It's
also save to say that the effective waterline length of a 40 ft boat
is actually less than 40 ft. Another factor is something called
prismatic coefficient which if a fancy way of describing how sleek
your hull form is. Obviously it's going to take more power to drive a
40 ft square box through the water than a 40 ft sailboat. The
equation of 1.34 SQRT LWL is realy nothing more than an approximation
and is not written in concrete.