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Paper Title: Small Craft Freeboard and Stability: Approaches to Assessment and Perspective Improvements



A Nazarov, Albatross Marine Design, Thailand


Unfortunately, for craft below 24m in length certification bodies often apply approaches inherited from larger vessels; this might turn out to be unpractical and even dangerous. Specifics of recreational, commercial and paramilitary small craft freeboard and stability needs to be clearly understood; based on practical design experiences this paper presents the systematic review of existing approaches with conclusion on applicability and recommendations for further improvements. Freeboard requirements of different rules and standards are reviewed and compared with results of modeling and statistics and a new generalized approach for freeboard assignment is proposed. Intact stability criteria are categorized; sets of criteria from different rules and standards are compared. Based on existing designs, significance factors of different stability criterions are analyzed depending on category and size of craft. Of practical interest are requirements and realities for small craft inclining test procedures, and also approaches to multihull craft stability assessment. Damaged stability is reviewed in terms of feasibility of required damage cases for small craft, with respect to their confined spaces and layout limitations. Significance factors of damaged stability criterions are studied and priority cases to be considered are identified. Recommendations for location of watertight bulkheads and buoyancy elements on small craft are given. Conclusions useful at early stages of design are provided.


Transactions RINA, Vol 159, Part B1, International Journal of Small Craft Technology, Jan-Jun 2017 

DOI Number

DOI No: 10.3940/rina.ijsct.2017.b1.181

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