Pre-treating paulownia or balsa core

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vinman
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Re: Pre-treating paulownia or balsa core

Post by vinman »

I'm pretty stoked on how well this set came out with the new core material. I'm not really sure that I even needed to pre-seal such a small amount of paulownia. For the next set I'm going with no seal to see what it does.

It won't be a direct comparison because it is going in a much bigger ski, 188 cm 140/112/125 swallow tail. The expectation for lightness in this ski is not as great since it is pretty big, only to cut a bit of weight so it isn't sooooo heavy due to its size. But based on this last set I'd say I can get this ski into the 4.5-4.75 lbs range.
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pmg
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Re: Pre-treating paulownia or balsa core

Post by pmg »

I will be in for some Balsa lightweight touring skis within the next 3 weeks. I shared exactly the same idea. After poeple here did pre-seal, I will go for it, too and publish my findings. I have a very thin epoxy though, and the idea with the wood glue seems sensible, too.

Did someone ever try sealing balsa/paulownia using wood glue?

mammuth
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Re: Pre-treating paulownia or balsa core

Post by mammuth »

Balsa oder Bcomp Core?
Tom

pmg
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Re: Pre-treating paulownia or balsa core

Post by pmg »

Hi,

BComp bcore 200.

Its starting to snow outside just now :)

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vinman
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Re: Pre-treating paulownia or balsa core

Post by vinman »

After layup maybe 10 pair with paulownia stingers, I don’t really feel that pre-treatment is necessary.

If the paulownia soaks up some resin, I don’t the ink that would be bad since it is so soft. The resin will toughen the paulownia.

If you are doing a full paulownia core with only a hardwood
Mounting zone, then you might want to add something like a Kevlar layer or innnegra layer to increase the impact resistance.

My cores use only 2 stringers of paulownia in the range of 10-15mm wide depending on how ouch weight I’m looking to cut. With stringers like this a free ride ski in the range of 180cm with a waist of around 105mm the weight would be between 4 lbs and 4 lbs 6 oz range per ski.
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Lerio
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Re: Pre-treating paulownia or balsa core

Post by Lerio »

We have done some test on the subject using vertically laminated balsa, the sealed laminate was actualy heavier than the not sealed one and a little bit more prone to delamination.

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