Subject: Re: [harryproa] Two-Sided Infusion
From: "Rob Denney harryproa@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 5/31/2019, 6:03 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

1mm x 1mm channels at 20mm intervals is not a huge amount of resin, and it increases the bonding surface.  Still, every bit of weight saved helps..  

Be nice to lose the cost of the perforations as well, which would require a full grid on the table.  Not a problem if the resin did stick to the part rather than in the grid, which it should if the grid is waxed.  It should then come off the part with the peel ply except perhaps from the main channel.    Although this could be less than the spiral as the table does not reduce the size of the resin path the way a bag does so maybe 5mm  x 5mm instead of 12mm spiral.  Not sure it would save any epoxy, but would definitely be lighter.    

The mould side of the infusion will show the grid for sure, which will require some fairing if a showroom finish is required.  But if the grid is 2mm x 2mm, it should not be much.  And, unlike scored foam, the pattern will not show through the paint as the boat gets older/hotter/stressed.  Infusing through holes in the table is not much different from infusing through the foam, and a lot more work.

Something else to put on the list of things to try.  

Started glassing the ww hull of the mini cargo ferry today, looks OK.     Beams are ready for mounting.  Spars start tomorrow, along with some more glassing.  Lee board and oar are built, Bucket List hull leftovers will do for the tramp until I get the plastic recycling working..     Lack of machine tools/dislike of paying someone to experiment is holding this up, but using threaded rod and an alloy tube over the stove, the results are pleasing, albeit small.   

There is a video of a scale model sailing in Germany at https://youtu.be/ryldiAQCrRo and on the harryproa facebook page

Lots of interest in Kleen Breeze now that it has been handed over to a broker.  May sell this weekend.  

I am slowly starting to get rid of surplus bits and pieces.  The hull in this video is costing me storage.  Any reasonable offer will get it.  https://www.youtube.com/watch?v=DfhdRfBTt8o   

El may also have to go to make room for the mini cargo/ferry.
  

On Fri, May 31, 2019 at 12:51 PM '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 



| Worth a try, I think.

Given the recent discussion on SA regarding infusion vs prepreg, table channels seem a neat way to take one (last?) weight added part of infusion (channels and perforations in the foam) out of infusions.

It adds complexity of the mould for reduced infusion weight. But complexity and cost is removed by not having to channel and perforate the foam. And IF cnc cutting the foam is roughly equal to cutting the mdf, the mdf cuts are less work, as they are less complicated, not perforations, and are reused, compared to the foam. Unless back feeding through perforations of the mould is preferable.

So, my guess is this saves epoxy, weight, cost, and work. I think.

Would the distribution channels stick to the infusion skin, assuming a sealed (painted) and released mould?
Would the peelply then remove them from the infusion?
Can the peelply keep from falling into the distribution lines?

Seems a neat innovation.

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Posted by: Rob Denney <harryproa@gmail.com>
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