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Date: Mon, 12 Apr 2010 18:57:37 -0500
Message-ID: <h2g5cf132c1004121657r37b541fwc13453a5cd91354f@mail.gmail.com>
Subject: Re: [FlyRotary] Mistral Muffler
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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.


On Mon, Apr 12, 2010 at 6:47 PM, Lynn Hanover <lehanover@gmail.com> wrote:

> 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
>
> Here is one version of the Mistral muffler. Said to be the failed version.
> Well thought out. Superb exicution. Note that there appears to be a slip
> join in the main body between the flanges.  The whole muffler is encased in
> a cooling sleeve with a big blast tube on one end and a coaxial exhaust
> areounf the down pipe.
>
> My vote for the failure point is the flat disc closing the end of the perf
> tube.
>
> Nothing flat survives the pounding. If its flat it dies. Round, conical or
> spherical, yes. Flat no.
>
> Lynn E. Hanover
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>

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Lynn,=A0<div><br></div><div>Sorry, but I don&#39;t see a slip joint. =A0How=
ever, I do see what appears to be a plate welded over an apparent cutout in=
 the exhaust flange. =A0What I would really like to see is what&#39;s insid=
e. =A0</div>
<div><br></div><div>I follow you on the flat surfaces being a failure point=
. =A0That was one reason why I welded the inner tube to both ends... to kee=
p them from flexing and eventually failing. =A0Time will tell how well it w=
orks.=A0</div>
<div><br></div><div>Mark S.</div><div><br><br><div class=3D"gmail_quote">On=
 Mon, Apr 12, 2010 at 6:47 PM, Lynn Hanover <span dir=3D"ltr">&lt;<a href=
=3D"mailto:lehanover@gmail.com">lehanover@gmail.com</a>&gt;</span> wrote:<b=
r><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex;">
Ernest, <br>=A0<br>Copy you on that!=A0 What material type and thickness wa=
s the Mistral muffler?=A0 Anyone know what their design was like?=A0 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.=A0 =
It could have 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 weld=
ed to both end plates and the exhaust gasses don&#39;t strike the tube dire=
ctly but swirl around it.=A0 Yes, a piece may fatigue over time and crack o=
ff, but I can&#39;t imagine how it could plug up the exhaust 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&#39;m pretty sure I can ge=
t my little inspection camera up the tailpipe.=A0 If that fails, I can remo=
ve one of the O2 sensors and stick the camera through the hole for a peek i=
nside.=A0 <br>

=A0<br>Mark=A0 <br>=A0<br>Here is one version of the Mistral muffler. Said =
to be the failed version. Well thought out. Superb exicution. Note that the=
re appears to be a slip join in the main body between the flanges.=A0 The w=
hole muffler is encased in a cooling sleeve with a big blast tube on one en=
d and a coaxial exhaust areounf the down pipe. <br>

=A0<br>My vote for the failure point is the flat disc closing the end of th=
e perf tube. <br>=A0<br>Nothing flat survives the pounding. If its flat it =
dies. Round, conical or spherical, yes. Flat no.<br>=A0<br>Lynn E. Hanover=
=20
<br>--<br>
Homepage: =A0<a href=3D"http://www.flyrotary.com/" target=3D"_blank">http:/=
/www.flyrotary.com/</a><br>
Archive and UnSub: =A0 <a href=3D"http://mail.lancaironline.net:81/lists/fl=
yrotary/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists=
/flyrotary/List.html</a><br>
<br></blockquote></div><br></div>

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