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This capsize ratio was only intended to be a preliminary screening tool (see "Desirable and Undesirable Characteristics of the Offshore Yachts" edited by John Rousmaniere, published in 1987by Norton). Values less than 2, probably OK for "offshore" sailing, values of 2 or greater -- a more detailed stability analysis would be warranted.
Obviously there is a lot more to determining stability and resistance to capsize than just beam and displacement, such as the distribution of that displacement (vertical center of gravity), etc...
Regards,
Tim
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