ES Composite Pipe Repair

[Gray E Fowler]

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. 



Gray Fowler
Principal Chemical Engineer
Composites Engineering




"Wayne Galligan" <wgalligan at goodsonacura.com>
Sent by: discussion-request at nsrca.org
09/23/2003 10:33 AM
Please respond to discussion

 
        To:     <discussion at nsrca.org>
        cc: 
        Subject:        Re: ES Composite Pipe Repair


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.
 
Wayne G.
----- Original Message ----- 
From: Chuck Czarnik 
To: discussion at nsrca.org 
Sent: Tuesday, September 23, 2003 10:30 AM
Subject: ES Composite Pipe Repair

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
 
 

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