<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=US-ASCII">
<META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"
bottomMargin=7 leftMargin=7 topMargin=7 rightMargin=7><FONT id=role_document
face=Arial color=#000000 size=2>
<DIV>
<DIV>David, it's regular polystyrene foam of approximately 2# density and comes
in a folded bundle. Each pleat is around 1/4" thick. Steve Maxwell told me about
this stuff and that it is called Fan-Fold. The negative is that the
material comes with a polyester backing film which tends to make the material
take a set from bundling, etc. Its a bit wavy off the bundle. But a little
time with a sanding block and the backing comes off easily enough and material
straightens out pretty much. The positives are that it is similar in feel to
soft balsa but sands a bit easier to a decent finish. It has a very
close cell structure that should take water based paint fine. It is surprisingly
stiff material yet resilient. </DIV>
<DIV> </DIV>
<DIV>The material should hot wire easily if more complex shapes are needed. Dean
Pappas told me he has done that with this material type with good results. Lowes
sells the same composition in 2" thick 4x8 sheets in the insulation department.
So if you want really straight and flat stock, you can hot wire the 2" material
to the deisred thickness, and there would be no backing to worry about</DIV>
<DIV> </DIV>
<DIV>I am using it in a conventional build with minimal balsa structure
underneath. I believe that with a bit more structure, this material could build
a full sized pattern model for electric or gas. I intend to use silkspan over it
to form a stressed skin. The wing panels were very simple. I cut the correct
planform and prepped by beveling the LE and TE to appropriate angles, and glued
the LEs together first, forming a V. The next evening, with very light balsa
structure inside, I brought the TEs together and voila. A few pins to hold the
skins against the balsa and its a very light and stiff panel. Perfect for a 30
(eq) sized electric. I used a full depth 1/8" spar, which may be overkill, but
what the hell. There's also a bit of carbon in it in judicious places.</DIV>
<DIV> </DIV>
<DIV>The landing gear will be simple carbon tubing with axles glued in. Planning
to use DS281's in the beastie on DaveL's recommendation with the 770 rx</DIV>
<DIV> </DIV>
<DIV>The final weight is projected at around 2 1/2 pounds where it should be a
fine match for the A30 M16 Hacker motor. A real pocket pattern model</DIV>
<DIV> </DIV>
<DIV>MattK</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>In a message dated 2/8/2006 10:02:20 PM Eastern Standard Time,
dflynt@verizon.net writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>
<DIV><SPAN class=625475802-09022006>So Matt, is this a polyurethane hard foam
that you can cut and sand for creating plugs? What is the thickness of
it, and what is the density?</SPAN></DIV>
<DIV><SPAN class=625475802-09022006></SPAN> </DIV>
<DIV><SPAN class=625475802-09022006>David</SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of
</B>Rcmaster199@aol.com<BR><B>Sent:</B> Wednesday, February 08, 2006 2:58
PM<BR><B>To:</B> nsrca-discussion@lists.nsrca.org<BR><B>Subject:</B>
[NSRCA-discussion] Back to pattern stuff<BR><BR></FONT></DIV><FONT
face=Arial>
<DIV>
<DIV><FONT style="BACKGROUND-COLOR: transparent" face=Arial>Using bluecor
foam from Lowes seems to work well. Shapes easily, is reasonably strong
material and serves to hold the reinforcing sticks well. Accepts foam
friendly ca and probond very well. I sanded the polyester film backing off
since I am finishing in silkspan and water based polyu paint.</FONT></DIV>
<DIV><FONT style="BACKGROUND-COLOR: transparent"
face=Arial></FONT> </DIV>
<DIV><FONT style="BACKGROUND-COLOR: transparent" face=Arial>Have the main
components of the small pattern job about done. Wing spans 46" with an area
of 470 sqin. Fuse length is 50". I'll post pics when I get around to
it</FONT></DIV>
<DIV><FONT style="BACKGROUND-COLOR: transparent"
face=Arial>MattK</FONT></DIV></DIV></FONT></BLOCKQUOTE></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV> </DIV></FONT></BODY></HTML>