X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iw0-f173.google.com ([209.85.223.173] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4218650 for flyrotary@lancaironline.net; Mon, 12 Apr 2010 12:02:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.173; envelope-from=msteitle@gmail.com Received: by iwn3 with SMTP id 3so939876iwn.3 for ; Mon, 12 Apr 2010 09:02:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:received:message-id:subject:from:to:content-type; bh=92n2IGDvjKxJ/LQFuef7UqJ7PLC+2jFtOIpHAK4SSlM=; b=qbaCt2dJqsfz27mBE/MTXIXO6IfHs8OcZxoZ3e8WDTi1nPWGVlhB9AtP2rXsMmV2gf bQDtg7Wtjce/+JYO5pbI0jyToOubvR9Us39adS/ps4VidYIvNHIiW73iJ6vFLFU+N6/q NTf6g9KZFLOYCsa/puXMR/6FzGSiuhToxzpH0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=RSaahvmpzRWZQvLQBGOHdD7HsCkYFcJEKKjvgciyRMHln6bbCPZftMoeADtsZDm+le RQnOrRlsfgsY4yI2z7ZPFt/5aYK6CKb8mEDbYZ3gK0UNIRFn3hlwab29usA1yuLAO1YS s8YnAkDWXO/svSPbFfEq/aZcm0aIQ5XV4ntgo= MIME-Version: 1.0 Received: by 10.231.183.195 with HTTP; Mon, 12 Apr 2010 09:02:11 -0700 (PDT) In-Reply-To: References: Date: Mon, 12 Apr 2010 11:02:11 -0500 Received: by 10.142.117.14 with SMTP id p14mr1627964wfc.144.1271088131925; Mon, 12 Apr 2010 09:02:11 -0700 (PDT) Message-ID: Subject: Re: [FlyRotary] Re: Tangential muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=001636e0a8b694e7e304840c44d0 --001636e0a8b694e7e304840c44d0 Content-Type: text/plain; charset=ISO-8859-1 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 > --001636e0a8b694e7e304840c44d0 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Ernest,
=A0
Copy you on that!=A0 What material type and thickness was the Mistral = muffler?=A0 Anyone know what their design was like?=A0 I=A0know that someth= ing fatigued and plugged the flow, but I=A0never saw a drawing of their muf= fler or had anyone explain how the failure actually occurred.=A0 It could h= ave been a baffle plate that was not well supported on all sides.=A0 I don&= #39;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 s= wirl around=A0it.=A0 Yes, a piece may fatigue over time=A0and crack off, bu= t I=A0can't imagine how it could=A0plug up the exhaust path.=A0 But I g= uess anything is possible if Murphy has his way.=A0 I'll keep a close e= ye on it though.=A0 With a little finessing, I'm pretty sure I can get = my little inspection camera up the tailpipe.=A0 If that fails, I can remove= one of the O2 sensors and stick the camera through the hole for a peek ins= ide.=A0
=A0
Mark=A0=A0=A0

On Mon, Apr 12, 2010 at 8:30 AM, Ernest Christle= y <echristley@= nc.rr.com> wrote:
Mark Steitle wrote:
Ernest,
=A0Yes, I can inspect= it by looking up the tailpipe with a borescope. =A0I can also look in thro= ugh the three inlets. =A0Initially I tried drilling holes but soon realized= that this was futile. =A0That's when I turned to the side grinder. =A0= Material is .065 inconel and is supported on both ends. =A0If it starts com= ing apart I can cut the ends off and try something else. =A0 Mark
If you need a borescope to inspect it, there's no wa= y you're going to get a tool in there to round out the sides. =A0Keep a= close eye on those slot corners. =A0The worst case would be a chunk coming= loose just enough to bend over and clog the exhaust. =A0Mistral's =A0t= est pilot is reported to say, "That sucks."=20

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