X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([204.127.217.102] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4218728 for flyrotary@lancaironline.net; Mon, 12 Apr 2010 13:22:31 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.102; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-230-67-40.mco.bellsouth.net[74.230.67.40]) by isp.att.net (frfwmhc02) with SMTP id <20100412172153H0200nnh4fe>; Mon, 12 Apr 2010 17:21:54 +0000 X-Originating-IP: [74.230.67.40] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Tangential muffler Date: Mon, 12 Apr 2010 13:21:54 -0400 Message-ID: <614F3B2F99E2461994FAB58C92C43DA8@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0017_01CADA43.1EF028C0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcraWZry9SrDGwSnQEO6dXrXe8HkGQACR54g X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0017_01CADA43.1EF028C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit How many O2 sensors do you have? Did you mean EGT probes? That is really a good looking install. Did you try and tune your intake tubes? I am not sure how important that would be with a PP. The intake never gets closed off. There is just a seal passing by that cuts Lynn's "sausage" of air on the diagonal and begins to direct it into the next rotor face. I think Lynn should have been a teacher. When he explains something you know about all about it you are ever going to understand. Have you noticed any power differences running it on the ground? I guess with the CS prop set for takeoff, you might get a higher rpm? Or maybe there would only be a high pitched scream that would be the tires as the plane is dragged all over! :>) Bill B _____ 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_0017_01CADA43.1EF028C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

How many O2 sensors do you have?  Did you mean EGT = probes?

That is really a good looking install.  =

Did you try and tune your intake tubes?  I am not sure how important that would be with a PP.  The intake never gets closed off.  There is just a seal passing by that cuts Lynn’s “sausage” = of air on the diagonal and begins to direct it into the next rotor face.  I = think Lynn should = have been a teacher.  When he explains something you know about all about it = you are ever going to understand.

Have you noticed any power differences running it on the = ground?  I guess with the CS prop set for takeoff, you might get a higher = rpm?  Or maybe there would only be a high pitched scream that would be the tires as the = plane is dragged all over!  :>) 

 

Bill B

 

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."

 

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