Beneteau Keel bolts - Page 2 - SailNet Community
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post #11 of 66 Old 08-27-2018 Thread Starter
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Re: Beneteau Keel bolts

Jeff -

Looking at the photos it seems that the antifoul around the keel area flaked off.

Possible sign of flexure near the keel before it broke off?
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post #12 of 66 Old 08-27-2018
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Re: Beneteau Keel bolts

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Originally Posted by Lazerbrains View Post
Jeff -

Looking at the photos it seems that the antifoul around the keel area flaked off.

Possible sign of flexure near the keel before it broke off?
Good point, I had seen the bottom paint flaked off around the keel. You may be right that there was flexure near the keel before the failure which led to the paint failure.

I actually has blown up the close up photo trying to get a better sense of what could have caused this. When I did there were a few more oddities visible. For example if the failure resulted from a lot of flexing of the hull, you would expect to see a lot of spider cracks in the gelcoat and barrier coat, I don't see those.

When you blow the picture up, it looks like you can see the second and third from the stern keel bolt washers in place and intact. That would suggest that this was in part a keel bolt failure, but if this was a keel bolt failure, then what would have caused the hull to tear away.

The shoal draft version of this boat had an iron keel with iron keel bolts, and perhaps they rusted and dropped the keel, but I still have to wonder what then would have caused the comparatively clean cut that is visible in the picture.

It will be interesting to see what is figured out. Anyone know where this occurred and what happened to cause the keel to separate?

Jeff


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post #13 of 66 Old 08-27-2018 Thread Starter
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Re: Beneteau Keel bolts

Found out a little more information. The boat is a 2006 Beneteau First 36.7 per the salvager who pulled her up.

Freshwater boat.
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post #14 of 66 Old 08-27-2018
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Re: Beneteau Keel bolts

Those French guys are dang good engineers. Lots of math, finite element analysis, safety factors.

But that's not how you attach a high-aspect, bulbed keel. This is how you attach a keel.

(the keel bolts to the bottom. the sides bolt to the longitudinal stringers. posted earlier today, from Francis Lee)
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Re: Beneteau Keel bolts

"I would have thought the bolts would pull before the structure itself would fail."
And in fact, just aft of center, it appears that one of the keel "stud bolts" that B inserts into the top of their cast iron keels, is still attached to the hull on the starboard (down) side of the keel mounting area.
Is the saildrive normal on that model? Or does it reflect a boat in the EU market?
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post #16 of 66 Old 08-27-2018
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Re: Beneteau Keel bolts

It just seems strange to see a sunken boat pulled up with the main still covered and the jib furled up like that, almost looks like it sank at a dock. The tear does look a little more jagged on the forward side. Canít wait to hear more details on the circumstances leading up to that.


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post #17 of 66 Old 08-27-2018
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Quote:
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It just seems strange to see a sunken boat pulled up with the main still covered and the jib furled up like that, almost looks like it sank at a dock.... Can’t wait to hear more details on the circumstances leading up to that.


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It could have happened while motoring and they ran it into something.
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Re: Beneteau Keel bolts

According to the salvager, it "hit a reef".
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Re: Beneteau Keel bolts

Another photo. Apparently they made a quick plywood/5200 patch and pumped out the water to get it back in.
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post #20 of 66 Old 08-27-2018
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Re: Beneteau Keel bolts

I wonder if they had a depth finder?
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