Larry Bell,
Gary, I am using the Styrofoam type insulation foam from Home Depot.
The main reason is availability and cost. There are some other factors. You
cannot hotwire the urethane. In a lot of situations hotwire is a lot
cleaner and easier. I have seen the urethane foam basically disintegrated
on an older plane, the Styrofoam holds up better. You can form urethane
easier with cutting tools but it makes a mess and you can damage it very
easily. I made a hotwire cutting saw for making straight and compound
pieces. It works just like a band saw except it is a hotwire. Hotwire takes
practice but works slick when you get used to it. I make all my parts with
wood frames and use them as hotwire guides. Burt Rutan uses both on the
Very Easy and details all things composite in a publication I think you can
get at Aircraft Spruce. I refer to that publication "Moldless Composite
Homebuilt Sandwich Aircraft Construction" all the time. You would need
some urethane, as an example the center two ribs on the wings are formed by
using the plywood inner and outer ribs as a guide and forming them out of
urethane. I am going to do that and then make them from plywood and go back
to hotwire.
Hope this helps, Larry Bell
On Wed, Jun 18, 2014 at 9:05 AM, Dan Prichard via KRnet <
krnet at list.krnet.org> wrote:
> Here in Oregon the stuff is hard to get. Shipping from aircraft spruce is
> way to high. I got ahold of some walk in cooler panels and used the foam
> when molding the upper deck stuff. The foil backed foam from Home Depot is
> poly ISOcyanurate. It sands real well and is 2 lbs density. The surface
> under the foil is a bit grooved and rutted but just keep that in mind when
> selecting pieces. The biggest advantage is cost. 2" stock is around $35 for
> a 4 x 8 sheet. A little extra work but for me it works great.
>
> Sent from my iPhone
>
> > On Jun 18, 2014, at 7:12 AM, Pat and Robin Russo via KRnet <
> krnet at list.krnet.org> wrote:
> >
> > Your local lumberyard may have urethane foam sold as insulation. It
> comes backed with tin foil. Simply peel off the backing. I have used this
> for years with success....I think!! I never keep a plane long enough to see
> what the long term effects might be. I have also used the blue board
> insulation with success on many projects.
> > Pat Russo
> >
> > -----Original Message----- From: jon kimmel via KRnet
> > Sent: Wednesday, June 18, 2014 9:12 AM
> > To: KRnet ; GaryH
> > Subject: Re: KR> foam...
> >
> > Dow sold trymer 2000 to itw several years ago...if you go to this website
> > and follow the links for where to get it you will get distributors in
> your
> > area...i drove to dallas for mine.
> >
> > http://www.itwinsulation.com/trymer/prod/t2000xp.htm
> >
> > https://sites.google.com/site/mykr2stretch/
> > https://sites.google.com/site/mykr2stretch/parts-for-sale
> >> On Jun 17, 2014 9:41 PM, "GaryH via KRnet" <krnet at list.krnet.org>
> wrote:
> >>
> >> Okay. Who out there has a good supplier for urethane foam sheets as
> per KR
> >> plans, and inexpensive.
> >>
> >>
> >>
> >> Regards,
> >>
> >>
> >>
> >> Gary
> >>
> >>
> >>
> >> Soli Deo Gloria
> >>
> >>
> >>
> >> _______________________________________________
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