Old 02-09-2019, 11:35 AM
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Join Date: Sep 2003
Location: CA & San Carlos, Mx
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Originally Posted by Island Marine Group View Post
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.
Ok, so foam cores filling and providing wider spaces between laminates is something that composite engineers are doing all wrong if you want to stiffen your structure using less pounds of fiberglass and hulls like cape horn and boston whaler have not proven themselves bullet proof. You are talking shear but you leave tensile (stiffness) strength out of your analysis.
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