On Friday 13 August 2004 6:59 pm in rec.boats Chris Newport wrote:

Third, displacement speeds are proportional to the square root
of waterline lenth. Typical displacement speed is 1.3*len(feet)^2

Ooops - before anyone else notices the branefart :-
Displacement speeds are proportional to the square root of
waterline lenth.
Typical displacement speed in knots is 1.3*sqrt(len) where len is in feet.


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