ES Composite Pipe Repair

[Ed Miller]

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 ??
Ed M.
  ----- Original Message ----- 
  From: Gray E Fowler 
  To: discussion at nsrca.org 
  Sent: Tuesday, September 23, 2003 5:40 PM
  Subject: Re: ES Composite Pipe Repair



  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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