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sergioboat
10-23-2007, 04:52 AM
hi from italy, sorry for my bad english.
One question:
In the plans, molds are in wood laminate but if i build its in plywood?
I commit a mistake?
Mrleft8
10-23-2007, 08:22 AM
Plywood is laminated wood. Each "ply" is a laminate. I think this is a case of different words meaning the same thing.
Welcome to the forum!!!
Brian Palmer
10-23-2007, 08:45 AM
Hello, Sergio,

I think you are asking whether you can replace laminated frames with plywood frames.

I do not think the plywood would be as strong as the laminated frames unless they were much larger in their molded dimension (distance from the inside edge to the planking), taking up valuable cabin space.

--Brian
Joe ( Cold Spring on Hudson )
10-23-2007, 08:56 AM
Sergio here is a visual comparison for you.

http://www.grahamdavies.net/files/images/napoleon.jpg

http://www.diydata.com/materials/manmadeboard/plywood2.jpg

You see how the Napoleon pastry has layers or cream and cake. Thats exactly how laminated plywood is the cream is the glue and the cake is the layers of wood.
Canoez
10-23-2007, 09:05 AM
The other thing to remember is that the plywood has grain in different directions to give it stiffness, strenth and stability.

Joe- bad comparison when I'm hungry in the morning with a cup of coffee in front of me.
sergioboat
10-23-2007, 09:08 AM
Ok, maybe I used the wrong words but Brian Palmer understood me perfectly
Mrleft8
10-23-2007, 09:10 AM
Ok, maybe I used the wrong words but Brian Palmer understood me perfectly...AH! In that case, you would (In my oppinion) be making a mistake.
sergioboat
10-23-2007, 09:19 AM
Ok, you are joking about my words wrong?
I am using the translator google.
Certainly translates into incorrectly
Canoez
10-23-2007, 09:27 AM
Don't forget to consider what the designer specifies for scantlings - in other words, the designer has selected a particular type of frame material in a particular dimension for the strength of it. Pay attention to what Mr. Oughtred has put on his plans.
Mrleft8
10-23-2007, 09:52 AM
Ok, you are joking about my words wrong?
I am using the translator google.
Certainly translates into incorrectly
No, not joking, or making fun of you. If the plans call for laminated frames (ribs), you should not substitute plywood.
sergioboat
10-23-2007, 10:15 AM
Ok, I understand.
Better follow the directions of designer
Joe ( Cold Spring on Hudson )
10-23-2007, 10:22 AM
No, not joking, or making fun of you. If the plans call for laminated frames (ribs), you should not substitute plywood.

Agreed I read it wrong myself sorry for the Napoleon analogy.
Brian Palmer
10-23-2007, 10:57 AM
Ok, maybe I used the wrong words but Brian Palmer understood me perfectly

Happy to help!

--Brian
manos
10-24-2007, 02:46 PM
Sergio, if it was a small light boat the difference is not important but
Grey Seal is a BIG boat(one of my favorites) I agree with the other guys
that you should follow the plans at least to the structural critical points
JimM
10-25-2007, 12:04 AM
Sergio

Have you found Dale H. Website Alistego. He built Oughtred's Eun Na Mara. The construction method is the same for Grey Seal. This site is worth studying as you build.
http://www.alistego.com/Site/Welcome.html