X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp104.sbc.mail.ac4.yahoo.com ([76.13.13.243] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with SMTP id 4218890 for flyrotary@lancaironline.net; Mon, 12 Apr 2010 14:33:49 -0400 Received-SPF: none receiver=logan.com; client-ip=76.13.13.243; envelope-from=bryanwinberry@bellsouth.net Received: (qmail 70030 invoked from network); 12 Apr 2010 18:33:14 -0000 Received: from adsl-88-102-31.asm.bellsouth.net (bryanwinberry@98.88.102.31 with login) by smtp104.sbc.mail.ac4.yahoo.com with SMTP; 12 Apr 2010 11:33:14 -0700 PDT X-Yahoo-SMTP: OSuEAS2swBAaBd4uKxevNivslbMG7JXpWjAWZVmoYyRm6qcW_W2VUA-- X-YMail-OSG: UlOkvrEVM1mh08tbpKjolCnr4ErQWFJDdTc1ReX9qWRYFGblM_t1JQ8w3tn3PY2wDcmkrhVH7eWXHVi1P3S_3sVnSx03eBFAm7yg7ageU8RgbU6w_RnX.xvZubNs4ChDMyiE9HpGv062o7EmtguQWZvN6wghFAq1uEBPpap_OW6oUQ3K0Lzrp5VPlQyL1mzuvHHS.Xm6xVmZknWuqDuSODnYGngQgvmEcqhZP5mkdmTjYrH5uTNsLaz3yaxdt4TfRGcKcYz9kgMyIC6oILH_5IdEutOV3_cYp8RHD4_e2rOn X-Yahoo-Newman-Property: ymail-3 From: "Bryan Winberry" To: "'Rotary motors in aircraft'" References: Subject: RE: [FlyRotary] Re: Tangential muffler Date: Mon, 12 Apr 2010 14:33:11 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0078_01CADA4D.1470BC70" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcraWZryj9xjAN7cQJq8mJ1Wb8S3xgAFIYEw X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0078_01CADA4D.1470BC70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Mark, Nice looking exhaust. I'm cheering for your design to succeed. Did you attempt to measure the area of the perforations in the inner tube, or did you just TLAR it? Bryan _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle Sent: Monday, April 12, 2010 12:02 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Tangential muffler Ernest, Copy you on that! What material type and thickness was the Mistral muffler? Anyone know what their design was like? I know that something fatigued and plugged the flow, but I never saw a drawing of their muffler or had anyone explain how the failure actually occurred. It could have been a baffle plate that was not well supported on all sides. I don't see how that could happen to my muffler as the tube is welded to both end plates and the exhaust gasses don't strike the tube directly but swirl around it. Yes, a piece may fatigue over time and crack off, but I can't imagine how it could plug up the exhaust path. But I guess anything is possible if Murphy has his way. I'll keep a close eye on it though. With a little finessing, I'm pretty sure I can get my little inspection camera up the tailpipe. If that fails, I can remove one of the O2 sensors and stick the camera through the hole for a peek inside. Mark On Mon, Apr 12, 2010 at 8:30 AM, Ernest Christley wrote: Mark Steitle wrote: Ernest, Yes, I can inspect it by looking up the tailpipe with a borescope. I can also look in through the three inlets. Initially I tried drilling holes but soon realized that this was futile. That's when I turned to the side grinder. Material is .065 inconel and is supported on both ends. If it starts coming apart I can cut the ends off and try something else. Mark If you need a borescope to inspect it, there's no way you're going to get a tool in there to round out the sides. Keep a close eye on those slot corners. The worst case would be a chunk coming loose just enough to bend over and clog the exhaust. Mistral's test pilot is reported to say, "That sucks." -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0078_01CADA4D.1470BC70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Mark,

Nice looking exhaust. =  I’m cheering for your design to succeed.  Did you attempt to measure the area of = the perforations in the inner tube, or did you just TLAR = it?

 

Bryan

 

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Monday, April 12, = 2010 12:02 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: Tangential muffler

 

Ernest,

 

Copy you on that!  What material type and thickness was the Mistral muffler?  Anyone know what their design was like?  I know that something fatigued and plugged the flow, but = I never saw a drawing of their muffler or had anyone explain how the failure = actually occurred.  It could have been a baffle plate that was not well = supported on all sides.  I don't see how that could happen to my muffler as = the tube is welded to both end plates and the exhaust gasses don't strike the = tube directly but swirl around it.  Yes, a piece may fatigue over time and crack off, but I can't imagine how it could plug = up the exhaust path.  But I guess anything is possible if Murphy has his way.  I'll keep a close eye on it though.  With a little = finessing, I'm pretty sure I can get my little inspection camera up the = tailpipe.  If that fails, I can remove one of the O2 sensors and stick the camera = through the hole for a peek inside. 

 

Mark    =

On Mon, Apr 12, 2010 at 8:30 AM, Ernest Christley <echristley@nc.rr.com> = wrote:

Mark Steitle wrote:

Ernest,
 Yes, I can inspect it by looking up the tailpipe with a borescope.  I can also look in through the three inlets.  Initially I = tried drilling holes but soon realized that this was futile.  That's when = I turned to the side grinder.  Material is .065 inconel and is = supported on both ends.  If it starts coming apart I can cut the ends off and = try something else.   Mark

If you need a borescope to inspect it, there's no way you're = going to get a tool in there to round out the sides.  Keep a close eye on = those slot corners.  The worst case would be a chunk coming loose just enough = to bend over and clog the exhaust.  Mistral's  test pilot is reported = to say, "That sucks."

 

------=_NextPart_000_0078_01CADA4D.1470BC70--