Old 02-09-2019, 08:38 AM
Island Marine Group
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Join Date: May 2013
Location: Isle of Palms, SC
Posts: 389

Originally Posted by 72barracuda View Post
In a Boston Whaler, I would say the foam is very structural.
Not really. Boston Whaler hulls are two parts built in separate molds. The outer (hull) and an inner (liner) molds are mated together while the fiberglass is still uncured. The structure is created by what they call "shear ties". These are pieces of fiberglass that are inserted in between the molds. Their purpose is to tie the two fiberglass parts together and prevent them from moving in the horizontal plane relative to each other. (Shear) You need enough shear ties to prevent movement, but not too many or it will prevent the foam from flowing from it entry point at the bottom to its exit point at the top. The first article of each design is built with clear gelcoat so you can see inside and make sure the foam filled the void and the shear ties are intact. While the foam does provide some rigidity to the skins, it is not relied upon for structure.

Last edited by Island Marine Group; 02-09-2019 at 08:41 AM. Reason: spelling
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