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post #9 of Old 12-09-2015
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Re: Examples of cca era sailboats

Rating= .95(L+B+D+P+S+F-I+A+C) * Propeller Factor * R Factor
L = 30% of the LWL + 70% of the length at 4% Water Line Plane
B = Average Beam over several points
D = Draft (with additions and corrections)
P = Cube root of the yacht's displacement with corrections
S = Square root of the sail area, with corrections
F = Average Freeboard, with corrections
I = a credit, if you have an iron keel
A = a correction for bow overhang
C = a correction for stern overhang
The propeller factor is based on folding, non folding, on or off centerline, etc.
R = a factor relating to the ballast/displacement ratio.
Hmmm... what an inspired equation. Notice the beautiful overhang of the R factor, balanced by the curving sheer of the .95 ratio... beautiful.

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