GB/T 20895.2-2025 Small craft—Stability and buoyancy assessment and categorization—Part 2:Sailing boats of hull length greater than or equal to 6 m

Scope

This document describes the methods for assessing the stability and buoyancy of sailboats with a complete (i.e., undamaged) hull length of not less than 6 m, and also includes methods for assessing the buoyancy of boats prone to waterlogging and sinking.
By using this document to evaluate stability and buoyancy, a design category (A, B, C, or D) appropriate to the boat's design load and maximum load is assigned to each boat.
This document applies to the assessment and classification of the stability and buoyancy of boats with a hull length of 6 m to 24 m and primarily powered by sails (including those equipped with auxiliary engines). It also applies to the assessment and classification of the stability and buoyancy of boats with a hull length of less than 6 m, provided they are habitable boats that do not meet the design categories specified in ISO 12217-3 and have a deck and rapid water drainage recesses that comply with ISO 11812 requirements.
This document includes an assessment of the rollover sensitivity of habitable multihull boats, the definition of feasible escape methods, and requirements for rollover buoyancy.
This document does not include: — Inflatable boats and rigid inflatable boats covered by ISO 6185, except for references to specific provisions of ISO 12217 in ISO 6185; — Paddleboards; — Windsurf boards; — Hydrofoil boats and foil-stabilized boats not navigating in displacement mode.
Note: Displacement mode refers to the situation where the boat is supported solely by hydrostatic forces.
This document does not consider or evaluate the impact of towing, fishing, dredging, or lifting operations on stability. Such situations should be considered separately (if applicable).

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