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Date: Sat, 20 Nov 2010 05:32:53 -0600
Message-ID: <AANLkTik19UyuZ2muWYFWnm3ok8-KHxBZbwrkiF1MKZAZ@mail.gmail.com>
Subject: Tangential Muffler
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=0015174c198238b6da04957a6261

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Guys,

It has been way too quiet on the list lately, so I thought I would post this
report.  Yes, another muffler experiment.  Seems I can't get beyond the
exhaust system.

I did an experiment yesterday... with interesting results.  While I am very
pleased with the muffling qualities of the tangential muffler, I have been
suspicious of it being responsible for the less-than-expected performance of
my p-port 20b.  So, I removed the tangential muffler and replaced it with
the previous 3-into-1 exhaust w/DNA muffler that I had been running for
about 100 hrs.

First the bad news.  The 3-into-1 system is much louder, to the point that
it almost overwhelms my Zulu.  I haven't shattered any windows, but little
children and small animals have been reported running for for their mothers.
 FWIW, I'm running the stock exhaust splitters that came in the 20B
housings.

The positive news is that I picked up 10-12 mph on top speed!  So, it
confirms my suspicions that the tangential muffler is too restrictive for my
engine.  While definitely not optimal, the 3-into-1 design is clearly better
than the tangential muffler when it comes to making power.

So, my plan is to build another exhaust from 625 inconel, making all three
runners 31.5".  I haven't decided what I will use for a muffler.  I'll
report back when I have more data.

Mark

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Content-Type: text/html; charset=ISO-8859-1
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Guys,<div><br></div><div>It has been way too quiet on the list lately, so I=
 thought I would post this report. =A0Yes, another muffler experiment. =A0S=
eems I can&#39;t get beyond the exhaust system. =A0<div><br></div><div>I di=
d an experiment yesterday... with interesting results. =A0While I am very p=
leased with the muffling qualities of the tangential muffler, I have been s=
uspicious of it being responsible for the less-than-expected performance of=
 my p-port 20b. =A0So, I removed the tangential muffler and replaced it wit=
h the previous 3-into-1 exhaust w/DNA muffler that I had been running for a=
bout 100 hrs. =A0</div>
<div><br></div><div>First the bad news. =A0The 3-into-1 system is much loud=
er, to the point that it almost overwhelms my Zulu. =A0I haven&#39;t shatte=
red any windows, but little children and small animals have been reported r=
unning for for their mothers. =A0FWIW, I&#39;m running the stock exhaust sp=
litters that came in the 20B housings.=A0</div>
<div><br></div><div>The positive news is that I picked up 10-12 mph on top =
speed! =A0So, it confirms my suspicions that the tangential muffler is too =
restrictive for my engine. =A0While definitely not optimal, the 3-into-1 de=
sign is clearly better than the tangential muffler when it comes to making =
power. =A0 =A0<div>
<br></div><div>So, my plan is to build another exhaust from 625 inconel, ma=
king all three runners 31.5&quot;. =A0I haven&#39;t decided what I will use=
 for a muffler. =A0I&#39;ll report back when I have more data. =A0</div><di=
v>
<br></div><div>Mark</div></div></div>

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