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Balsa cored hulls - old boats
Workmanship makes a real difference in this question. We own a 1987 Nonsuch 30''. The 30''s and larger were cored above and below the waterline with end grain balsa. The boat was purchased two years ago at a yard in Essex that had 25 or 30 Nonsuches, ranging in age from 1979 to 1990. None of the boats had blistering problems, and there were no reports of problems with the core material.
The Nonsuch listserve, which can be found at the International Nonsuch Association site www.nonsuch.org) has had no conversations at all about either blisters, delamination, or core problems in the 8 months I have been on it. This has about 300 to 400 members from the association of perhaps 600. There were approximately 1,000 boats made.
I''ll pose the question, but I think it''s a non issue. The hulls were laid up very carefully.