| A couple of things, at least as I understand them;
1. This was not the muffler that caused the Mistral Arrow crash. This one was designed and built by Mistral. I don't know it's current status. The one that failed was purchased from someone - I don't know who.
2. The muffler is constructed either mostly or entirely of Inconel. Again, I don't remember all the details.
This is information I gleaned from my discussion with Mistral's chief engineer at the time. Sorry, but I don't remember all of the details.
Best Regards,
Steve Thomas _______________________________________________________
On Apr 12, 2010, at 10:36 PM, Al Gietzen wrote: Personally, I'm not too crazy about the perforated pipes. Seems they would take the brunt of the exhaust energy. Mark S. Likewise; and I think the flat ends of those tubes is what Lynn’s referring to?? I don’t know what the material is, presumable 321 SS or similar; in which case they were doomed from the start. High stress, high temp, and corrosive gases results in (intergranular) stress corrosion >> failure. Just my speculation, Al Lynn, Sorry, but I don't see a slip joint. However, I do see what appears to be a plate welded over an apparent cutout in the exhaust flange. What I would really like to see is what's inside. I follow you on the flat surfaces being a failure point. That was one reason why I welded the inner tube to both ends... to keep them from flexing and eventually failing. Time will tell how well it works. The black arrow points to a band of material wrapped around what I suspect is a cut through muffler. The red arrows point to the edges of the band. It is welded only on the right end. The lite sheet between the flanges would be to prevent cooling air leaks into any number of ports into the center iron used to feed air into the stock exhaust ports to reduce HC and cool NOX. This is all speculation on my part.
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