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Old 21 September 2011, 08:30   #11
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My opinion. Never wood in stringers . 6 -7 600 layers of matte and you have a very robust whole.
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Old 21 September 2011, 11:36   #12
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Originally Posted by Rogue Wave View Post
How are they held on to the hull. if not for the layup on the top and dides.

i genuinely thought the strength came from the glass being shaped over the wood, i just thought you went foam to save weight. I am obviously refering to GRP hull and am happy to learn something

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Every wood stringer I have ever seen is covered with one layer or two of mat/roving to keep out water and yes hold them to the hull too. But the whole point of the stringer is to provide stiffness and for wood stringers that stiffness is not provided by the mat layers on top. Slapping on more GRP more won't do much. Foam stringers have basically no stiffness by themselves at all, the "box" of GRP around them provides their structure.

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Yes. Stringers need help. From further advice the wood ones need beefing up.. Still unsure how many layers of bi-axial. Thanks for comments About professional advice. Would kinda defeate the object of a forum though!

I have been in contact with the builder, and the bloke who actually laid her up. She is derakane resin.
Maybe so, but seems like you are in over your head. Its not clear what the original problem is and whether 2 layers of bidirectional mat are going to address that problem at all. Especially given this new revelation that you need "beefier" stringers.
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Old 21 September 2011, 16:27   #13
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Every wood stringer I have ever seen is covered with one layer or two of mat/roving to keep out water and yes hold them to the hull too. But the whole point of the stringer is to provide stiffness and for wood stringers that stiffness is not provided by the mat layers on top. Slapping on more GRP more won't do much. Foam stringers have basically no stiffness by themselves at all, the "box" of GRP around them provides their structure.



Maybe so, but seems like you are in over your head. Its not clear what the original problem is and whether 2 layers of bidirectional mat are going to address that problem at all. Especially given this new revelation that you need "beefier" stringers.
I am being cautious what I say, as a deal is still being done. I dont know your background, nor you mine, you have not provided a specific laminate schedual (which I wouldnt expect, just a general idea) despite the fact I answered your questions, therefore, as my boss says, if your not part of the solution your part of the problem! Cant a guy think allowed

Maybe I didnt make myself too clear, the additional stringers are wood, but the quality of laminating is poor. Even though I am in over my head, I know that the wood needs to be covered in something, and not just paint!! The boats history is unclear. In all fairness most boats dont tell you their entire story when you shake their hand on 1st introduction. Difference is, I am going out of my way to find this ol girls history out and the price will reflect my findings....

As a hobiest I have laminated plenty, just not so much with epoxy cloths. Hence the original question.
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Old 21 September 2011, 16:28   #14
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My opinion. Never wood in stringers . 6 -7 600 layers of matte and you have a very robust whole.
thankyou. I watched your video over half a year ago.. Good to see, new stuff arriving, and the locals watching too
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Old 21 September 2011, 16:31   #15
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But the whole point of the stringer is to provide stiffness and for wood stringers that stiffness is not provided by the mat layers on top.
Yes...

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Foam stringers have basically no stiffness by themselves at all, the "box" of GRP around them provides their structure.
Yes...

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Slapping on more GRP more won't do much.
Erm...isn't that a bit contradictory? If there are wood longitudunals and they are well laminated over, won't you have the best of both worlds? Even further, foam filled longits often fail because there is no internal of worth to prevent the laminate deforming, with consequential failure. As well as the gross load in the first place of course.

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Maybe so, but seems like you are in over your head.
Hehe, not after we've finished with him!!
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Old 21 September 2011, 16:36   #16
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Originally Posted by Rogue Wave View Post
How are they held on to the hull. if not for the layup on the top and dides.

i genuinely thought the strength came from the glass being shaped over the wood, i just thought you went foam to save weight. I am obviously refering to GRP hull and am happy to learn something

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I "THINK", there are active and inactive cores. The ones under engines are frequently active cores, in other words the wood, takes some load, and not just the outside shape. The inactive ones, are the foam/hollow ones for example. But I think many people more smart than us, debate this frequently.. I love modern stuff and think wood has been replaced, but when cookee and others stick a tree in their boat.......... Its pretty obvious there is a good reason!
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Old 21 September 2011, 17:26   #17
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I am being cautious what I say, as a deal is still being done.

<snip>

Difference is, I am going out of my way to find this ol girls history out and the price will reflect my findings....
So the boat is beat to hell. She has been repaired before but the stringers are still in poor shape and delaminating. You are asking on the internet how to DIY repair them and not posting pictures of the issues or full details because you are afraid your eventual sale price might be compromised by your repair inquiries...

Shadey.

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As a hobiest I have laminated plenty, just not so much with epoxy cloths. Hence the original question.
Maybe there's a language issue here, but I'm assuming you are using glass cloth and epoxy resin...

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Erm...isn't that a bit contradictory? If there are wood longitudunals and they are well laminated over, won't you have the best of both worlds? Even further, foam filled longits often fail because there is no internal of worth to prevent the laminate deforming, with consequential failure. As well as the gross load in the first place of course.

Hehe, not after we've finished with him!!
Maybe. But the "box" won't be the right shape for the load compared to a designed foam stringer so slapping more GRP on a wood stringer may or may not accomplish anything. It will seal it from water (yay!) and add weight (boo hiss). Structurally its hit or miss. I've seen some good stringer repairs and some that made matters worse (sealing in water, yikes)
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Old 21 September 2011, 18:20   #18
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look at this
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Old 22 September 2011, 02:46   #19
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thankyou. I watched your video over half a year ago.. Good to see, new stuff arriving, and the locals watching too
I think the exchange of views never hurt anybody.
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