46 CFR § 171.057 - Intact stability requirements for a sailing catamaran.

---
identifier: "/us/cfr/t46/s171.057"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 171.057 - Intact stability requirements for a sailing catamaran."
title_number: 46
title_name: "Shipping"
section_number: "171.057"
section_name: "Intact stability requirements for a sailing catamaran."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "S"
subchapter_name: "SUBDIVISION AND STABILITY"
part_number: "171"
part_name: "SPECIAL RULES PERTAINING TO VESSELS CARRYING PASSENGERS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 2103, 3306; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 79-023, 48 FR 51017, Nov. 4, 1983, unless otherwise noted."
cfr_part: "171"
---


# 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]