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Re: tartan 3500 cored hull question
I would safely assume it is built just like my T-4100, in which case it is a balsa core that transitions to solid glass at any stress areas or at bulkheads and through-hull penetrations. Balsa has a superior bonding with the fiberglass/epoxy than does any foam coring so balsa represents a much stronger core structure. My 4100 has an exterior skin that is close to 1/2" thick, then the 1/2" of balsa and then about 5/16" interior laminate creating a hull that is 1-5/16" thick, much thicker than many other production boats. I feel very confident that I will not have any issues with the hull unless I hit a container, then all bets are off.
I had a Tartan 37 for 20 years, never had an issue with the core........