where-
X = 1.0 long tons/sq. ft. (10.9 metric tons/sq. meter).
Y = 1.1 long tons/sq. ft. (12.0 metric tons/sq. meter).
Z = 1.25 long tons/sq. ft. (13.7 metric tons/sq. meter).
where-
HZA, HZB, and HZC are calculated in the manner specified in paragraph (e) or (f) of this section.
X = 1.5 long tons/sq. ft. (16.4 metric tons/sq. meter).
Y = 1.7 long tons/sq. ft. (18.6 metric tons/sq. meter).
Z = 1.9 long tons/sq. ft. (20.8 metric tons/sq. meter).
A = the projected lateral area or silhouette in square feet (meters) of the portion of the vessel above the waterline computed with all sail set and trimmed flat. Sail overlap areas need not be included except parachute type spinnakers which are to be added regardless of overlap.
H = the vertical distance in feet (meters) from the center of A to the center of the underwater lateral area or approximately to the one-half draft point.
W = the displacement of the vessel in long (metric) tons.
HZ = HZA cos2 (T)
where-
HZ = heeling arm.
HZA = heeling arm at 0 degrees of heel.
T = angle of heel.
HZ = HZB cos2 (T)
where-
HZ = heeling arm.
HZB = heeling arm at 0 degrees of heel.
T = angle of heel.
HZ = HZC cos2 (T)
where-
HZ = heeling arm.
HZC = heeling arm at 0 degrees of heel.
T = angle of heel.
where-
I = the area under the righting arm curve to-
T = the downflooding angle or 60 degrees, whichever is less, when computing HZB or 90 degrees when computing HZC.
46 C.F.R. §171.055