171.057—Intact stability requirements for a sailing catamaran.
(a)
A sailing vessel that operates on protected waters must be designed to satisfy the following equation:
Where—
B=the distance between hull centerlines in meters (feet).
As=the maximum sail area in square meters (square feet).
Hc=the height of the center of effort of the sail area above the deck, in meters (feet).
W=the total displacement of the vessel, in kilograms (pounds).
X=4.88 kilograms/square meter (1.0 pounds/square foot).
(b)
A sailing vessel that operates on partially protected or exposed waters must be designed to satisfy the following equation:
Where—
B=the distance between hull centerlines in meters (feet).
As=the maximum sail area in square meters (square feet).
Hc=the height of the center of effort of the sail area above the deck, in meters (feet).
W=the total displacement of the vessel, in kilograms (pounds).
X=7.32 kilograms/square meter (1.5 pounds/square foot).
[CGD 79-023, 48 FR 51017, Nov. 4, 1983, as amended by CGD 83-005, 51 FR 924, Jan. 9, 1986; CGD 85-080, 61 FR 944, Jan. 10, 1996]