On 16 Jul 2007 22:18:28 +1000, GB
wrote:
Bruce wrote in
:
Of course it is your boat and you should build it the way you think
best but do take into consideration that literally thousands of stitch
and glue boats and if the method wasn't effective certainly there
would be comments all over the net.
I agree. I'm not questioning the method so much as questioning
my own knowledge of what works and what doesn't. I grew up in an
environment where tradesmen were never called, we figured out and
fixed /everything/ ourselves, be it plumbing, home extensions,
electricals and electronics. I've kinda developed a bit of a
feel for materials, and what works and what doesn't. You know,
certain types of glue will fix certain materials, and will be
completely ineffective on others, etc, etc. I have a bit of
difficulty with the concept of a near-solid (as in almost brittle)
epoxy contributing any sort of strength to a butted joint between
two bits of ply. I'm not saying it won't work, just that it
conflicts with my own experiential knowledge of how things 'work'.
On PVA type glues, I'm very much aware (and continually
amazed) by just how strong a join that stuff makes between two
pieces of timber, but again, I have conceptual problems with
using it on a join that's designed to be dunked in a pond!
My own exposure to fibreglass is limited to canoe-building class
in high school. Those were well before OHS days, so we were all
so high on the fumes that there wasn't much consciousness left
to develop a feeling for just how strong a fibre-tape/epoxy
join might be!!!
Hence all the questions! I'm sailing (pardon the pun) in
uncharted waters!
Thanks, I appreciate your comments.
GB
Try the epoxy before you ignore it.
Make a 90 degree butt joint with 1/4 inch plywood and glue it with
epoxy. Mix up some epoxy and some sort of filler, sanding dust from
the same kind of wood you are glueing works fine, and form a fillet
approximately 1/2 inch wide on the inside of the 90 degree joint, Then
wet out a 4 inch wide piece of glass tape with epoxy and place that
over the fillet. Roll out any bubbles and let it harden for 48 hours
and then try to break it. Twist it, pry it, whatever you want, and
you'll find that the plywood fails long before you can break the joint
itself.
Bruce in Bangkok
(brucepaigeatgmaildotcom)
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