In our last post we were looking at some cross sections of composite sandwich windsurf boards and discussing some of the componentization of them. One item that we failed to mention was the density of the skin. Now we didn’t make those boards, and none of them is a wakesurf board, so we’re guessing based upon the foam color. Two of the boards appear to have a Divinycell H100 skin or skins as evidenced by the slightly tan’ish color. The final example was a Divinycell H80 skin as evidenced by the gray colored foam skim. H80 is a five’ish pound density foam and the H100 is a six’ish pound density foam. That extra density will also have some extra compressive strength. It’s very hard to see, but the interior foam in those windsurf boards wasn’t sealed. There is a tendency to seal EPS foam to prevent the interior EPS foam from soaking up the epoxy resin, but we are seeing that many of those production boards do not make that effort. Some of that may be to reduce costs. The sealing of the EPS foam is an extra step and takes additional time as the sealing agent cures. We are also noting that by allowing the resin to soak into the interior foam there is a three dimensional reinforcement effect. Definately something we want to pursue further in our wakesurf board R&D as the Z-pin processing is proving exceptionaly labor intensive without a machine.
Going back to our gray and blue sandwich, you can see that we’ve traced the outline of the board on the deck side of the wakesurf board.
We use a simple jigsaw to trim the outline to the markings and true it all up with a sanding block.
This is a side view of the tail showing the H80 skins and we are using two H45 sheets (the blue pieces) as the core.
After truing up the cut, we use the sanding block to shape the rails and thge slight tuck. It’s hard to see in this picture, but that steps been done!
Then one last check on the rocker bed to make sure that everything is still aligned. Seems to still be in shape so we’re ready to begin exterior lamination.
We are hoping to get this board finished by the weekend, but that may be pushing it some. Hopefully the external fiberglass for the bottom will go on.
3 comments
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Dorie
January 18, 2012 at 3:32 am (UTC -7) Link to this comment
A provociatve insight! Just what we need!
private jet charter
January 19, 2012 at 9:05 pm (UTC -7) Link to this comment
Really nice style and design and good content material , nothing else we want : D.
Renting a Plane
January 29, 2012 at 5:20 am (UTC -7) Link to this comment
Thanks. I look forward to reading more on private jet interior.
Wakesurf board components
January 12, 2012 at 4:30 am (UTC -7) Link to this comment
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