From: "Alex Madsen" <madsena@rose-hulman.edu>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: High Temperature Epoxy Selection
Date: Wed, 7 Jul 2004 12:55:35 -0500
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Nice site. I will call them tomorrow and see what they have to say.
Maybe I can get a test sample or the "student experiment" discount.

Alex Madsen

P.S. (I am not sure if I should mention this yet) If all goes will with
manifold development I may eventually look into compost exhaust with
this stuff:
http://www.graphitestore.com/itemDetails.asp?item_id=1561&prd_id=6&cat_i
d=4&curPage=1

This will be an even more interesting experiment. 

Alex Madsen

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Marvin Kaye
Sent: Wednesday, July 07, 2004 12:43 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: High Temperature Epoxy Selection

I did a Google search on "high temperature laminating epoxy" and came up
with 
a huge amount of hits.  I particularly liked what I saw at De-Comp 
Composites... http://www.decomp.com/indexA.htm.  Once there and poking
around 
I noticed that some of their product line is used by Boeing... quite the

recommendation.  Down in the hi-temp laminating area I spotted all sorts
of 
resin systems, all requiring post cure, and all with very impressive
strength 
numbers.  I clicked on their link to a hi-temp flame retardant system 
(http://www.decomp.com/laminate/htlfr.htm) which is good to a HDT of
375F, has 
a mixed specific gravity of 1.11 (figure 11% thicker than water...
excellent 
for layups) and thought it would be an ideal candidate.  Post cures in a

kitchen oven (if the parts will fit and the Missus doesn't mind) is
actually 
quite simple, as is vacuum bagging.  You don't actually need a real
vacuum 
pump, as you can pull a good vacuum with a shop-vac or on the intake
side of 
your air compressor.  I buy my bagging supplies from FibreGlast
Developments 
(hardware & fittings, bagging plastic, sealing tape) but I get my peel
ply 
from Aircraft Spruce and my breather ply from Joanne Fabrics (polyester 
fiber-fill batt insulation).  ACS is also a reasonbly priced source for
carbon 
fiber ($16.95/yd is excellent).  I have paid as much as $37/yd for wider

crow's foot weave, but that is a bit of a specialty product... much
stronger 
than plain weave, goes around curves really well and pleasant to work
with... 
it's just expensive.  Attached is my latest CF creation.. it's a ventral
fin I 
added to the tail of the IVP I've been talking about.  There are 14
plies 
around the edges and there's about no deflection when you beat on it.
It's 
basically 4 plies CF each side over a hardwood-strengthened foam core
with the 
edges wrapped and the whole thing peel plyed.  I really enjoy composite
work, 
and am always happy to talk about it.  Enough for now.  Thanks for
listening.

       <Marv>