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Re: Benataeu grid construction
"the iron keel rusting under water because, likely, nobody bothered repairing the glass."
Is the OP talking about an encapsulated keel, where damage would indicate a grounding? Or, is the OP just mistaken about "glass" with this being a typical faired--not encapsulated--Beneteau iron keel?
If it is just rusting because the fairing and coating was neglected, that's routine maintenance. To be expected unless you find a boat with a more expensive lead keel.
But if that's an encapsulated keel that indicates damage from a grounding, there's more reason to question what might have happened to the hull.
The liner and hull are "just" glued together. Like the tail and wings on combat aircraft and even some commercial jetliners. But even there...there was the tragic instance of the tail breaking off an Airbus after takeoff at JFK some years ago. Apparently the glue job wasn't strong enough, they hit turbulence from the flight before them, the plane broke.
Absent any sign of a grounding, this could easily just be the tabbing and gelcoat showing their age, and not a structural problem. But that's a decision for a competent engineer to make, hands-on. Old boats often show cosmetic cracking. I haven't heard of any Beneteau grids coming off their hulls.