Mailing List flyrotary@lancaironline.net Message #50889
From: Mark Steitle <msteitle@gmail.com>
Subject: Re: [FlyRotary] Mistral Muffler
Date: Mon, 12 Apr 2010 21:10:40 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Lynn, 

OK, now I see what you're talking about with the thin band around the main muffler can.  Would that even be necessary if they had used your slip-fit joints near the ports?  That's what I did which should allow enough movement to prevent cracking of the main muffler canister.  We'll have to wait and see on that.

Personally, I'm not too crazy about the perforated pipes.  Seems they would take the brunt of the exhaust energy.  

Mark S.

On Mon, Apr 12, 2010 at 7:23 PM, Lynn Hanover <lehanover@gmail.com> wrote:
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. 

Mark S.
 
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.
 
Lynn E. Hanover

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