X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4219495 for flyrotary@lancaironline.net; Tue, 13 Apr 2010 00:37:06 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao104.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100413043630.XLCV27176.fed1rmmtao104.cox.net@fed1rmimpo02.cox.net> for ; Tue, 13 Apr 2010 00:36:30 -0400 Received: from BigAl ([72.192.128.205]) by fed1rmimpo02.cox.net with bizsmtp id 4scR1e00B4S1t5C04scVjZ; Tue, 13 Apr 2010 00:36:29 -0400 X-VR-Score: -100.00 X-Authority-Analysis: v=1.1 cv=KqzZVGv1/pIBe+XbL3gCBfL8vaFXECOST7Bs1vfp5Gs= c=1 sm=1 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=pGLkceISAAAA:8 a=7g1VtSJxAAAA:8 a=Ia-xEzejAAAA:8 a=AOnN9x_Z5px8wzgsApYA:9 a=tn8Ap4rfkvgNI_b8n7gA:7 a=P461MCGf64u83i544Z7zUH02ss4A:4 a=CjuIK1q_8ugA:10 a=Qa1je4BO31QA:10 a=MSl-tDqOz04A:10 a=6J87LtgAD4gRIBzJdiIA:9 a=YbcFSOHYeVeqa-W_BIEA:7 a=aJO8jZO3CqNRQeq4pMxhusD1EuEA:4 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Mistral Muffler Date: Mon, 12 Apr 2010 21:36:53 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002B_01CADA88.471DE770" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 Importance: Normal Thread-Index: AcrarpyaFo4QCobgQnyIzOV+at0cegAG/uig X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_002B_01CADA88.471DE770 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Personally, I'm not too crazy about the perforated pipes. Seems they = would take the brunt of the exhaust energy. =20 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 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 =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 =20 This is all speculation on my part. =20 Lynn E. Hanover -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html =20 ------=_NextPart_000_002B_01CADA88.471DE770 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

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

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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