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<< Lancair Builders' Mail List >>
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Mark,
Last weekend I used the Jeffco 9700 on my LIV wing. I sanded the
entire inside of the fuel bays and then cleaned with MC. Used
shop compressor to blow away all dust. I applied the second coat
within two hours of the first. Pot life was only 15 to 20 minutes
and only mixed 2 ounces of sealer at a time. Any more would start
to overheat before I got it all applied. Temp in my hanger was
around 78F. I followed the instructions that were with the sealer
from Lancair. Turned out OK. I hope.
I am also interested in knowing how much Hysol to apply to the
spar.
Skip Long
LIV, HWD
[The subject of allocating the proper amount of structural adhesive seems
to be a recurring theme here, and a couple of things immediately come
to mind in this regard... first of all, it is unlikely that any two
projects will go together identically, so the amount of adhesive required
for one person's wing closeout will also likely not apply to another's.
With this in mind, the most logical solution calls for the second point,
that being to come up with a way to accurately determine the adhesive
amount required for each project individually in a relatively quick and
easy fashion.
The LNC2 builders have a similar situation with trying to ascertain how
much foam filler needs to be attached to the stub wing spar tops to
take the place of a really thick flox mixture that would likely exotherm
and cause adhesion problems somewhere down the road. I believe the
approach that I took in this area could be modified slightly to provide an
adequate measure of the adhesive volume for a similar area on any other
project.
I used ribbons of modelling clay spaced about a foot apart to provide me
with a gauge of the varying thicknesses required along the spar's
length. Apply the ribbons across the spar (front to back), then set the
wing skin with weights only over the clay ribbons to get the proper shape
on the airfoil. Remove the top skin and the shaped clay ribbons will
provide you with depth measurements along the length of the spar. In my
case I attached foam between the ribbons and sanded it down to the tops
of the bordering clay walls, sort of like screeding concrete. For this
application, though, I would think that filling in between the clay walls
with sand and then screeding it down to their levels would give one an
excellent determination of the volumes all along the way. You could then
scrape the sand and the clay into a graduated measuring cup of some kind
and be within a few percent of the actual volume required.
This is one suggestion, perhaps others out there have similar ideas that
would also work as well or better. Just a thought. <Marv> ]
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LML homepage: http://www.olsusa.com/Users/Mkaye/maillist.html
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