Subject: Re: [harryproa] Re: 15m schooner underway
From: Rob Denney
Date: 4/18/2013, 1:06 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Vacuuming is quicker to set up, does not need as much accuracy and care, can use less resin and does not need a sealed (permanent) table.  It is also stressful as you are racing to get the resin on, ensure that large amounts do not stay in the bucket and exotherm, the entire job is wet out (not easy with glass on a white table) and then sealing 30 metres of bag.    Not helped by mysterious holes appearing in the bag, scales suddenly ceasing to measure, vac hoses falling apart and the sun shining through gaps in the doors and heating small areas.  All have happened, but only one panel has been a throwaway so far, and we may salvage the foam from that.  


Resin amounts in the laminates are pretty similar as they are quite thin.  Infusion fills any gaps, so all edges have to be perfect vertical cuts (power saw, not Stanley knife), all cut outs have to be accurate and the bag needs more attention to avoid runways for the resin.  

We are now getting pretty proficient, so the only infusion will be for the lw hull halves as they have a lot of tricky bits in them.  

Perf foam is used for both to let the air and resin out of the lower laminate and foam.

Process is as you say, but we apply resin to the table side of the foam as well to help wet it out.   After the resin, we apply peel ply (sometimes), perf plastic,  bleeder and then the bag.

rob

On Thu, Apr 18, 2013 at 12:28 AM, Gardner Pomper <gardner@networknow.org> wrote:
 

Rob,

This may have been answered already, but I can't locate it. Why are you going with vacuum bagging instead of infusion on these panels? It looks like you got perforated foam and I would think that infusion would be less time dependent for short handed work and end up with possibly less resin in the laminate.

Are you applying resin to the lower fiberglass, laying the foam, adding the upper fiberglass, applying resin and then bagging?

- Gardner


On Wed, Apr 17, 2013 at 6:09 AM, proaharry <harryproa@gmail.com> wrote:
 

Latest update on the web page now, including costs so far and the new look cabin, although this is still in a state of flux.

We have decided to build a couple more panels for the new cabin top before dismantling the table and starting assembly of the ww hull which should now happen next week.

Comments and questions welcome.

rob



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