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I have friends who own Boston Whalers, and this same topic comes up between them. Over the years, any water that finds its way into the sealed, foamed core has no way out and can add considerable weight, canceling some of the bouyancy benefits of the foam.
The inner hull drain provides peace of mind, if nothing else. It could be opened once per year, or after every trip. It's just insurance against the eventual accumulation that can occur over the years.
I have an experience on the flipside: One time I went out, I forgot to close the inner hull drain. You know what happened? Not a thing. I unintentionally verified that closed cell foam doesn't absorb water very rapidly. We traveled at full speed, rose on plane just as fast, and at anchor didn't sit any lower in the water - those pesky rear skuppers were just keeping even like they always do. I didn't even realize my oversight until I pulled the boat trailer up to the prep area. Enough water came out the open drain to fill one tall drinking glass. That's it.
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