Thanks for testing again Mike.
I am sure you have read all i have written about the importance of it being wrapped.
Your Image
Shows what i mean as its not wrapped at all. The loose ends of the cloth must be stuck to something thats porous. So in our case that is wood or another layer of cloth, but not just foam. If its not porous it will simply not dry or bond, if one part is porous it will dry over a long time and bond to one side and slightly stick to the other.
You need very little stick as long as the foam cannot move. All the strength is from the porous to porous joint not to the foam
This is wrapped
I think this is one of the issues with using foam, in that people wrongly think covering foam on one plane with something makes it some sort of super strength composite but is doesn't. Its just keeps the outer skin in place and stops it moving, its the skin thats the strength. Wrapping the foam adds a lot more strenth.
An example:
Paper is week, layer it with a few bends and it becomes Cardboard, which is much stronger. But Cardboard laid flat is still weak, but fold it into a box and it becomes a lot stronger, now fill the box with foam its becomes even stronger, now wrap that box in something and it becomes super strong.
But its still made from paper.
The Chinese made papermache furniture 1000's of years ago and its still around today, putting layer on layer on layer with laquer made it very strong.
In boat building they build up the layers with more layers in points of stress. The areas that have no stress are not that thick.
There is no way a single layer of cloth stuck to foam will be strong enough for some of us, so simply add more layers.
In Eagles build, she added wood and a double layer in places so the single layer of cloth is only in some places. Even those places are foam, TB2, cloth, diluted TB2, undercoat and topcoat all supported by spars and bulkheads.
Eagle admits that if she went out and cut a join she could peel off the skin but is she going to do that, I doubt it.
The fact is that she made a TD in a few weeks and has used it several times. She is already planning another and will change her design. All this in the time most of us are still thinking about it.
I think both Eagle and GPW would agree that the following statement is important.
"If in doubt put another layer on"