Stabilty curves from Desirable and Undesirable Characteristics of Offshore
Yachts shows that a general hull form designed to the International Rule
(rule that produces 12 meters) or the Universal Rule
(which produced the New York
40 class) have no part of the curve in the negative part of the graph, IOW these boats have no stability upside down.
Marchaj compares the Contessa 32 against Grimalkin, an IOR 1/2 tonner that were both in the 79 Fastnet in his book Seaworthiness the Forgotten Factor. Note that the Contessa has positive stability up to 160 degrees over.
Stability curves for Contessa 32 and IOR 1/2 tonner:
Contessa 32 NE PLUS ULTRA
Left for Dead is a book by the guy who survived being on Grimalkin in the 79 Fastnet race