|
Lynn and others on the Mistral Muffler
According to the Mistral Team at Oshkosh 09, the
Muffler shown in the current photos is not the one that failed but a secondary
down stream muffler that plugged over time and eventually brought the Florida
test aircraft down. The muffler in the various photos is substantially composed
of inconel, gage unknown to me. I was hoping to use this muffler for my 13B and
Conversion Concepts Mount for my RV-9A, but a cardboard template that I took to
Oshkosh showed that the connector flange on the outlet would almost touch the
left rear rubber mount. I do have the Mistral Intake Manifold that adapted
quite readily to my '89 NA 13B.
Dean Van Winkle 13B, RD-1B,
EC2, EM2
----- Original Message -----
Sent: Monday, April 12, 2010 6:47
PM
Subject: [FlyRotary] Mistral
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
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
|