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post #11 of 40 Old 02-20-2019
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Re: Benataeu grid construction

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Originally Posted by newbie3 View Post
Ah okay. I really wish it was easier to see exactly where the grid is joined to the hull.

So you're saying that direct grid delamination occurs at a specific height?

No, the grid extends above the inner surface of the hull to a heights of about 30-36" above the keelson.

I think some of the surveyor markings appear much lower. Can delamination appear in such a way where the grid is still intact and joined to the hull? Or is any delamination a sign of a system wide failure and it doesn't mater where you find it?

There is no sign of "delamination" in any of your photos
.
The structural grid is a shaped pan that is inserted into the hull while the hull is still curing so that the grid binds with the hull chemically as well as with adhesive. The grid "pan" on the Firsts is approximately 30 to 36" deep, hence on either side of the hull it extends upwards baring against the inner sides of the hull to approximately 30-36" above the inner surface of the hull at the keelson. Before being bonded to the hull, rectangular panels are cut out of the pan between the "ribs" (or the up-right channels running athwart ship that the sole is fastened to) leaving an approximately 3" "wing" on either side of each of the channels which bare against and are bonded to the hull. Several layers of fiberglass tape are then lapped over these channel "wings" and the inner hull surface and laminated in place as continuous "tabbing". This tabbing was then surface finished with the same color gel-coat as used on the pan itself and this gel-coat that occasionally shows signs of cracking which is cosmetic.

I don't have words to make this description any clearer to a novice (as to yacht construction). If you have misgivings, I suggest you search out a copy of the book I referred you to earlier, turn to page 42 and commence reading. The photos therein will make understanding the construction method clearer.

In short, however, what you've illustrated in your snaps are nothing of consequence. If your surveyor doesn't know that, I suggest you find another surveyor. One schooled in Beneteau construction.

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post #12 of 40 Old 02-20-2019
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Re: Benataeu grid construction

the locations of the crack in the photo's are not where the delam will happen. those are gelcoat cracks and are not structural

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post #13 of 40 Old 02-20-2019
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Re: Benataeu grid construction

The pictures that you took look to me like the stringer has cracked where it meets the "wing". It also doesn't look like gelcoat because I can see fiber in the layup on both sides of the crack, as well as separation.

So, to me, it looks like those two areas are indeed a crack in the interior pan where it is bonded to the hull.

I have no experience with Bene layup.

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post #14 of 40 Old 02-20-2019
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Re: Benataeu grid construction

I feel that asking about the problem to an Internet forum instead to on site professionals is just interesting and just giving people something to “discuss”. Does the OP really wish to be talked into this boat?

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Last edited by Don0190; 02-20-2019 at 09:20 PM.
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post #15 of 40 Old 02-20-2019
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Re: Benataeu grid construction

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I have no experience with Bene layup.

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post #16 of 40 Old 02-20-2019
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Re: Benataeu grid construction

I was being honest, while also using decades of fiberglass experience to wonder about what I was seeing. While your explanation makes sense in general, can you explain better why the cracks in the two pictures the OP took show cracks at the corner where the vertical pan stringer meets the horizontal "wing" flange is, and not at the wing/hull interface as you described? Also why if this is only a gelcoat crack, there are seemingly integral glass fibers on both sides of the cracked areas? And why these cracks have so much separation?

The pictures the surveyor took look more like what you describe, but the two OP pictures look more troubling to me.

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post #17 of 40 Old 02-20-2019 Thread Starter
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Re: Benataeu grid construction

In my own defense... the seller came down on the price after the survey. And I'm still holding off. So I'm not as crazy as some of you may think

The only way I would move on purchase is if the price met the value of the mast and engine... both of which are salvageable. The rest is a learning experience. We haven't even touched on the elephant in the room.. the iron keel rusting under water because, likely, nobody bothered repairing the glass.

I think one reason why I'm here on this thread.. if I'm honest with myself.. is there's very little inventory out here for 38' sailboats in the PNW. You either have $100k to spend... you get lucky.. or you find a project. This is certainly the "project" and you may never see the light of summer with it since it would be all spent in a bilge. I've been looking for a while and there is an occasional down easter 38' or C&C but I'm not personally a huge fan of the layouts, sail rigs, or the designs... There was a Catalina 36' which went for $30k.. it was interesting but a premium and I'm not getting what I really want. I'm in a bit of a limbo for years now. For now I'm still looking... unless this seller hands over the title for salvage cash and I have myself a project.. or a mast and engine
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post #18 of 40 Old 02-21-2019
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Re: Benataeu grid construction

Dont waste your time.
Sounds like your looking for a salvage boat on the cheap, which I don't think happens here
What do you have to spend on this 35-38 foot boat?

Finding a boat greater miles away and expanding your search area may work, just add the cost of trucking it if no inventory works where you live


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post #19 of 40 Old 02-21-2019
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Re: Benataeu grid construction

This thread is crazy.

The OP hires a professional who sounds the hull and marks the grid where he finds it delaminated.

The OP comes to the internet for second opinions and posters look at pictures and announce its gelcoat cracking.

Nutty.

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post #20 of 40 Old 02-21-2019
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Re: Benataeu grid construction

I believe that Beneteau acknowledge that tabbing on the grid can fail after a hard grounding and they have published a suggested repair procedure.

There was some considerable discussion on the matter of the Bene grid and repairs after the keel fell off Cheeky Rafiki mid Atlantic and 4 sailors were lost. I am sure that any professional surveyor would be aware of this.

I would follow the surveyors advise.
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