CS23 Build Config: Open Deck / Closed Transom

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fallguy1000
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by fallguy1000 »

B is incorrect unless you are fixing a hole or low area.

Here is all the rationale.

1. Laying longest first avoids potential air entrainment at overlap edges in b and poor bonds.

2. Sanding thru b can result in sanding the stagger off completely.

3. Strength in fiberglass is not achieved by shingling or effect of shingling. The strength in fiberglass happens with thickness. People generally get the intuition wrong here.

There are a few times other than hole repair where you may consider the other way..if, for example building up 3 layers allows the 3rd layer to go over a ridge or rise, anytime we end up fairer, we'd go shortest first, but then caution to fill the voids is important, etc.
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fallguy1000
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by fallguy1000 »

Wow, that was fun. I got a and b confused in my reply and had to go back and fix it twice!
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fallguy1000
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by fallguy1000 »

DD351FDE-BA9C-4A9F-9972-05A7E3E08283.jpeg
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rsiedl
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by rsiedl »

Thanks heaps for that info.
1. Laying longest first avoids potential air entrainment at overlap edges in b and poor bonds.
I've already noticed how hard it is to get the air out, so it makes a lot of sense.
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rsiedl
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by rsiedl »

OK, I thought I had my head around it but now I'm beginning to question myself.

If someone would be able to clarify if I've got this right, it would be greatly appreciated.

So going by this lamination schedule:

Image

The completed outer layers would look like this?

Image

Also, where it mentions:
A. Hull Bottom: 2 layers fabric, inside and out
I assume fabric means biaxial cloth (as that is all I have on the BOM)?
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TomW1
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by TomW1 »

Yes, fabric and cloth are interchangeable here in the states. Also, I see three other problems. fallguy caught one, the second is you did not carry the first layer of fiberglass cloth up the side the 152mm and the third is on the chine you only have one of the tapes wrapping the corner, you need to change the second one so it has a short side on the bottom and a long side up the side. As it is providing no strength to join. Well I hope that helps you a bit. Feel free to ask questions.

Tom
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rsiedl
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by rsiedl »

Thanks Tom, I think I understand.

Is this more accurate?

Image

(First layer of cloth would wrap 177mm up the side to ensure the 2 cloth layers are staggered)
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by TomW1 »

It looks good. Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

rsiedl
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by rsiedl »

I've just realised why some of the fabric doesn't wrap (as per the lamination schedule by Jaques) - the fabric isn't wide enough.
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fallguy1000
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Re: CS23 Build Config: Open Deck / Closed Transom

Post by fallguy1000 »

If you draw what you have now, we can tell you how to get to finish. Overlaps are part of life in bigger boats.
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