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 4218887 for flyrotary@lancaironline.net; Mon, 12 Apr 2010 14:31:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.173; envelope-from=msteitle@gmail.com Received: by iwn3 with SMTP id 3so1122891iwn.3 for ; Mon, 12 Apr 2010 11:31:10 -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=Bme7dOMZaGMoeT6ids7ulaf53OXWcaVXgU22cFC1Ogs=; b=tJNlAbfn4WQjjgPqsZYd6044g+gfAHe7ftxbDv250xlplAOGJ1oQiILghbXXwRhhQ6 uoMMNsmmsFWk5yZX0oobwyuheMpXZlv4Z/eu3Hk2iP5ibYyGhFVVO0BTqp0EfAu0AmJ0 RdGTfakdlbqkWQNxKktY+k2xdrgZV5MX9m1yU= 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=JsGFmKAOYA3GtW2pNJNJSJCEBZLoKbuGBpyJyAlzEvJ59tpBq3AR0P019r2j+vpEmc tLiPUCkeieXXw4TF/RpNY7c3GJ+c5uHMZZ4wLb9QNrxiZmTIc9p9HbGvXQZuOpb3dsrm AeWbTHhfvernBKhGMeTfwlB60+gb6Iq0ZcrSQ= MIME-Version: 1.0 Received: by 10.231.183.195 with HTTP; Mon, 12 Apr 2010 11:31:08 -0700 (PDT) In-Reply-To: References: Date: Mon, 12 Apr 2010 13:31:08 -0500 Received: by 10.143.194.5 with SMTP id w5mr2039225wfp.105.1271097069030; Mon, 12 Apr 2010 11:31:09 -0700 (PDT) Message-ID: Subject: Re: [FlyRotary] Re: Tangential muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000e0cd60510464c8604840e5971 --000e0cd60510464c8604840e5971 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Bill, So that explains those two black lines across the parking area! ;-) It seems much more difficult to hold it during WOT runs. And it gets to temps much quicker when doing ground runs. But the real test will be the rate of climb and fuel burn. Mark On Mon, Apr 12, 2010 at 12:21 PM, Bill Bradburry wrote: > 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 s= eal > passing by that cuts Lynn=92s =93sausage=94 of air on the diagonal and be= gins 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] *O= n > 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 t= hat > could happen to my muffler as the tube is welded to both end plates and t= he > 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 Murp= hy > has his way. I'll keep a close eye on it though. With a little finessin= g, > I'm pretty sure I can get my little inspection camera up the tailpipe. I= f > that fails, I can remove one of the O2 sensors and stick the camera throu= gh > 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 ca= n > 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 ben= d > over and clog the exhaust. Mistral's test pilot is reported to say, "Th= at > sucks." > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > --000e0cd60510464c8604840e5971 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Bill,
=A0
So that explains those two black lines across the parking area!=A0 ;-)= =A0
=A0
It seems much more difficult to hold it during WOT runs.=A0 And it get= s to temps much quicker when doing ground runs.=A0 But the real test will b= e the rate of climb and fuel burn.
=A0
Mark=A0

On Mon, Apr 12, 2010 at 12:21 PM, Bill Bradburry= <bbradbur= ry@bellsouth.net> wrote:

How many O2 sensors do you have?=A0 Did you mean EGT = probes?

That is really a good looking install.=A0

Did you try and tune your intake tubes?=A0 I am not s= ure how important that would be with a PP.=A0 The intake never gets closed = off.=A0 There is just a seal passing by that cuts Lynn=92s =93sausage=94 of= air on the diagonal and begins to direct it into the next rotor face.=A0 I= think Lynn should have been a teacher.=A0 When he explains something you k= now about all about it you are ever going to understand.

Have you noticed any power differences running it on = the ground?=A0 I guess with the CS prop set for takeoff, you might get a hi= gher rpm?=A0 Or maybe there would only be a high pitched scream that would = be the tires as the plane is dragged all over!=A0 :>)=A0

=A0

Bill B

=A0

From: Rotary motors in aircraft [ma= ilto:flyro= tary@lancaironline.net] On Behalf = Of Mark Steitle
Sent: Monday, April 12, 201= 0 12:02 PM=20


To: R= otary motors in aircraft
Subj= ect: [FlyRotary] Re: Tangential muffler=20

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 something fatigued and plugged the flow, but I=A0never saw a d= rawing of their muffler or had anyone explain how the failure actually occu= rred.=A0 It could have been a baffle plate that was not well supported on a= ll sides.=A0 I don't see how that could happen to my muffler as the tub= e is welded to both end plates and the exhaust gasses don't strike the = tube directly but swirl around=A0it.=A0 Yes, a piece may fatigue over time= =A0and crack off, but I=A0can't imagine how it could=A0plug up the exha= ust path.=A0 But I guess anything is possible if Murphy has his way.=A0 I&#= 39;ll keep a close eye on it though.=A0 With a little finessing, I'm pr= etty 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 inside.=A0

=A0

Mark=A0=A0=A0

On Mon, Apr 12, 2010 at 8:30 AM, Ernest Christley <= ;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 through the three inlets.= =A0Initially I tried drilling holes but soon realized that this was futile= . =A0That's when I turned to the side grinder. =A0Material is .065 inco= nel and is supported on both ends. =A0If it starts coming apart I can cut t= he ends off and try something else. =A0 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. =A0Kee= p a close eye on those slot corners. =A0The worst case would be a chunk com= ing loose just enough to bend over and clog the exhaust. =A0Mistral's = =A0test pilot is reported to say, "That sucks."

=A0


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