I did a little searching on the Internet because I was curious; I had never heard of a Catalina with a cored hull. It turns out some newer Catalina models, mostly Capris but also some bigger boats, used Coremat to thicken the laminates. According to Jack Hornor and other sailboat reviewers, they technically are not cored hulls because the Coremat is not used to provide the necessary strength for the hulls. The reviews were unclear as to why Catalina needed to thicken the laminates. The answer may be obvious to someone who knows more about boatbuilding than me.
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