X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4219975 for flyrotary@lancaironline.net; Tue, 13 Apr 2010 11:47:21 -0400 Received-SPF: softfail receiver=logan.com; client-ip=68.230.241.41; envelope-from=glasair2@me.com Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao105.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100413154648.LZHR20564.fed1rmmtao105.cox.net@fed1rmimpo02.cox.net> for ; Tue, 13 Apr 2010 11:46:48 -0400 Received: from [192.168.2.201] ([70.177.24.126]) by fed1rmimpo02.cox.net with bizsmtp id 53mg1e00E2jEC4N043mllG; Tue, 13 Apr 2010 11:46:45 -0400 X-VR-Score: -100.00 X-Authority-Analysis: v=1.1 cv=KqzZVGv1/pIBe+XbL3gCBfL8vaFXECOST7Bs1vfp5Gs= c=1 sm=1 a=f32ykCDtWUuHg+z19x9HKQ==:17 a=pGLkceISAAAA:8 a=7g1VtSJxAAAA:8 a=Ia-xEzejAAAA:8 a=wER1h57DJRZUqRoW3vIA:9 a=dvHA-L8CYA_JawFAy1YA:7 a=a5JfrTeGFo-idP6Pur8nePHkmCQA:4 a=pILNOxqGKmIA:10 a=Qa1je4BO31QA:10 a=MSl-tDqOz04A:10 a=Y8gMcagzHYAtKUv6tY4A:9 a=mGxS1hjHqCORvHjPPJgA:7 a=omCQ_BL44zqiJfdnJyCV_xpQjo0A:4 a=f32ykCDtWUuHg+z19x9HKQ==:117 X-CM-Score: 0.00 From: Steve Thomas Mime-Version: 1.0 (Apple Message framework v1078) Content-Type: multipart/alternative; boundary=Apple-Mail-82-808624413 Subject: Re: [FlyRotary] Re: Mistral Muffler Date: Tue, 13 Apr 2010 08:46:40 -0700 In-Reply-To: To: Rotary motors in aircraft References: Message-Id: X-Mailer: Apple Mail (2.1078) --Apple-Mail-82-808624413 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 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. =20 2. The muffler is constructed either mostly or entirely of Inconel. = Again, I don't remember all the details. =20 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. =20= Best Regards, Steve Thomas _______________________________________________________ On Apr 12, 2010, at 10:36 PM, Al Gietzen wrote: > =20 > Personally, I'm not too crazy about the perforated pipes. Seems they = would take the brunt of the exhaust energy. =20 > Mark S. >=20 > Likewise; and I think the flat ends of those tubes is what Lynn=92s = referring to?? I don=92t 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. >=20 > Just my speculation, >=20 > Al >=20 > On Mon, Apr 12, 2010 at 7:23 PM, Lynn Hanover = wrote: > Lynn,=20 > =20 > 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. =20 > =20 > 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.=20 > =20 > Mark S. > =20 > The black arrow points to a band of material wrapped around what I = suspect is a cut through muffler. > =20 > The red arrows point to the edges of the band. > =20 > It is welded only on the right end. > =20 > 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. > =20 > This is all speculation on my part. > =20 > Lynn E. Hanover >=20 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html >=20 > =20 --Apple-Mail-82-808624413 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 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=92s referring to??  I = don=92t 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


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