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<DIV><FONT face=Arial size=2>Gray, I'm listening. A short lived $200 plus pipe
is not affordable either. Short of going back to aluminum and the weight
penalty, do we have another alternative ??</FONT></DIV>
<DIV><FONT face=Arial size=2>Ed M.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=gfowler@raytheon.com href="mailto:gfowler@raytheon.com">Gray E
Fowler</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, September 23, 2003 5:40
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: ES Composite Pipe
Repair</DIV>
<DIV><BR></DIV><BR><FONT face=sans-serif size=2>Concerning this repair, there
is not a commercially available adhesive that is going to do the job long
term. The adhesive I used on Wayne's pipe is an aerospace grade epoxy called
Hysol 9394, rated at 350F. AT 350F this epoxy exhibits about 25% of its room
temperature strength-and this is about the best room temperature curing high
temp epoxy available-in short all the stuff such as JB weld is crap at
the temperatures we are talking about. The inlet temp of our mufflers makes
for a brutal environment and unfortunately anything that cures at room
temperature just is not going to do the job very well. In reality Hysol 9394
is borderline. No easy answer here, and is evident by the constant postings
about burned out inlets....there is a problem with the composite mufflers.
Actually there is an answer, but I do not think our pattern market can
afford it. <BR><BR><BR><BR>Gray Fowler<BR>Principal Chemical
Engineer<BR>Composites Engineering</FONT> <BR><BR><BR>
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<TD><FONT face=sans-serif size=1><B>"Wayne Galligan"
<wgalligan@goodsonacura.com></B></FONT> <BR><FONT face=sans-serif
size=1>Sent by: discussion-request@nsrca.org</FONT>
<P><FONT face=sans-serif size=1>09/23/2003 10:33 AM</FONT> <BR><FONT
face=sans-serif size=1>Please respond to discussion</FONT> <BR></P>
<TD><FONT face=Arial size=1> </FONT><BR><FONT
face=sans-serif size=1> To:
<discussion@nsrca.org></FONT> <BR><FONT
face=sans-serif size=1> cc:
</FONT> <BR><FONT face=sans-serif size=1>
Subject: Re: ES Composite Pipe
Repair</FONT></TR></TBODY></TABLE><BR><BR><BR><FONT face=Arial
size=2>Hopefully Gray Fowler will see this post. He repaired my pipe by
using a piece of 7/8" aluminum wing tub and used a special high temp epoxy and
some fiberglass. Has held up well all year.</FONT> <BR><FONT face=Arial
size=2> </FONT> <BR><FONT face=Arial size=2>Wayne G.</FONT> <BR><FONT
face="Times New Roman" size=3>----- Original Message ----- </FONT><BR><FONT
face="Times New Roman" size=3><B>From:</B> </FONT><A
href="mailto:CCzarnik@arclp.com"><FONT face="Times New Roman" color=blue
size=3><U>Chuck Czarnik</U></FONT></A><FONT face="Times New Roman" size=3>
</FONT><BR><FONT face="Times New Roman" size=3><B>To:</B> </FONT><A
href="mailto:discussion@nsrca.org"><FONT face="Times New Roman" color=blue
size=3><U>discussion@nsrca.org</U></FONT></A><FONT face="Times New Roman"
size=3> </FONT><BR><FONT face="Times New Roman" size=3><B>Sent:</B> Tuesday,
September 23, 2003 10:30 AM</FONT> <BR><FONT face="Times New Roman"
size=3><B>Subject:</B> ES Composite Pipe Repair</FONT> <BR><BR><FONT
face=Arial size=2>I have one of these pipes with a damaged inlet. I
found an aluminum tube that fit inside the inlet almost perfectly and tried to
JB weld it in and clamp from the outside. That lasted about 15-20
flights, and now it leaks like crazy. Is there any kind of epoxy or
other sealant (e.g. high temp silicone) that will hold up better to the heat?
Pipe is used with a YS 140, so it gets pretty hot. I hate to let
this pipe go just yet. Any help appreciated! Chuck</FONT>
<BR><FONT face="Times New Roman" size=3> </FONT> <BR><FONT
face="Times New Roman" size=3> </FONT>
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