where:

K = 0.00216 when consistent English units are used or 1.113 when consistent metric units are used.

En = series summation notation where n varies from 1 to the number of elements in the series;

Vn = S[0.124LN(0.3048hn) + 0.772], in feet per second S[0.127LN(hn) + 0.772], in meters per second and is the wind speed for profile element “n” on a vessel;

S = 64 (19.5, if metric units are used) for a vessel that operates on protected waters; or 85.3 (26, if metric units are used) for a vessel that operates on waters other than protected waters;

LN = natural logarithm;

hn = the vertical distance from the centroid of area An to the waterline for profile element n, in feet (meters);

An = projected lateral area for profile element n, in square feet (square meters);

Zn = the vertical distance between the centroid of An and a point at the center of the underwater lateral area or a point at approximately one-half of the draft, for profile element n, in feet; and

W = displacement of the loaded vessel, in pounds (Newtons).

where:

s,X,Y = factors from table 28.575;

r = 0.73 + 0.6 Zg/d;

Zg = distance between the center of gravity and the waterline (+ above, − below), in feet (meters);

k = 1.0 for round bilged vessels with no bilge keels or bar keels; 0.7 for vessels with sharp bilges, or the value from table 28.575 for vessels with a bar keel, bilge keels, or both;

B = molded breadth of the vessel, in feet (meters);

d = mean molded draft of the vessel, in feet (meters);

Cb = block coefficient;

Ak = aggregate area of bilge keels, the area of the lateral projection of a bar keel, or the sum of these areas, in square feet (square meters);

L = length, in feet (meters);

T = 1.108 BC/square root of GM, in seconds; 2.0 BC/square root of GM, if metric units are used;

GM = metacentric height corrected for free surface effects, as explained in §28.540, in feet (meters);

C = 0.373 + 0.023(B/d)−0.000131L or 0.373 + 0.023(B/D)−0.00043L, if metric units are used.