Originally posted by Jim Bates
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Fresh out of the mold without a deck or bulkheads a 30 foot fiberglass hull can be displaced at the sheer by over a foot applying side force only by hand. It is the interior structure attached to the hull - much like a grid - that provides the stiffness.
There is a certain percentage of the bulkhead that can be removed as in the case of your holes without compromising its strength significantly but there is a limit too. Where that limit lies is the purview of the slide rule crowd.
Bottom line - please think of the bulkhead as structural and make it as strong as conditions allow.
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