On Sat, Oct 12, 2019 at 3:56 AM bobg3723@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
Thanks Rob, I'll look more into pre-treating balsa. My understanding that for anything above the waterline balsa has some very desirable features in a core material.
Lots of debate about whether it is overkill or not, and whether rigidity in a core is a good thing or whether it causes internal delamination. What is certain is that if it gets wet, it turns to slush, so all holes have to be properly sealed.
If I may ask, does that imply that, in equivalent cross sectional thickness infused foam core has a higher weight to strength ratio than infused balsa core?
Strength in which direction? On a weight basis, foam is pretty hard to beat.
If I understand it correctly, in a scenario where all things are equal, even greater quantities of resin would infuse into a balsa core sandwich than is typical of a foam core material?
An 80 kg per cubic metre foam will need between 1-200 gsm per sq m. Sealed balsa uses virtually none, in the areas where the seal is good. Anywhere it isn't, it will suck up as much as 50% of the balsa volume. There needs to be some compelling reasons to use balsa in an infusion. Cost and 'greenness' are 2 such, but in the overall scheme of things, PET foam is probably a better option.
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Posted by: Rob Denney <harryproa@gmail.com>
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