ES Composite Pipe Repair

[Edward Skorepa]

Hi Tom,

are you still @ 14 Tilley Place, McKellar, A.C.T.2617  ?

Ed
  ----- Original Message ----- 
  From: Koenig, Tom 
  To: 'discussion at nsrca.org' 
  Sent: Tuesday, September 23, 2003 4:09 PM
  Subject: RE: ES Composite Pipe Repair


  Sounds like a "market opening" for you Gray.  If you made it available, I 'd buy it! I first bought one of Ed's pipes not long after he made them available. It cost me over $500 Australian at the time. It lasted about 2-5 flights before my inlet got crushed by the teflon coupler, just behind the aluminium insert. I need a definite fix before I touch it!!!

  If I cant fix it, it will remain as one of my  not so smart modelling choices.

  Tom
    -----Original Message-----
    From: Gray E Fowler [mailto:gfowler at raytheon.com]
    Sent: Wednesday, 24 September 2003 7:41 AM
    To: discussion at nsrca.org
    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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