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Date: Sun, 6 Sep 2009 07:55:13 -0500
Message-ID: <5cf132c0909060555w37dc450ag1ce8509bc1dda396@mail.gmail.com>
Subject: Re: [FlyRotary] DNA muffler
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=00032555b78e7c729f0472e83e73

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Mike,

I had the same impression of the DNA muffler.  Then I remembered what Tracy
said about big pipes being louder than smaller pipes.  So, I ordered a
tapered transition piece from Burns Stainless, bringing it down from 3" to 2
1/4".  That helped reduce the noise considerably and I couldn't detect any
reduction in hp.  Or, you could spring for a pair of those $800 headsets, or
you could do both.

Mark S.
On Sat, Sep 5, 2009 at 10:46 PM, Mike Wills <rv-4mike@cox.net> wrote:

>  Received my DNA muffler this past week and got it installed and running.
> Havent flown it yet, but have done some taxi and full power runups. So far
> I'm a little disappointed. It doesnt appear to be any quieter than my home
> made muffler. I'll reserve judgement until I actually fly it, but from the
> cockpit the noise level seems the same, and my buddy standing about 50 '
> away said he thought the noise level was the same.
>
>  One thing not the same - the muffler screwed up my tuning. It appears to
> be considerably richer now all across the RPM range. And the big bog at the
> staging point that took me so long to tune out is back with a vengeance.
> Oddly, in spite of the tune issues it still appears to reach the same static
> RPM as previously.
>
>  Looks like the solution for me is going to be the high $ headset and the
> rest of the world is just going to have to live with it.
>
> Mike Wills
> RV-4 N144MW
>

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Content-Type: text/html; charset=ISO-8859-1
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<div>Mike, </div>
<div>=A0</div>
<div>I had the same impression of the DNA muffler.=A0 Then I remembered wha=
t Tracy said about=A0big pipes being louder than smaller pipes.=A0 So, I or=
dered a tapered transition piece from Burns Stainless, bringing it down fro=
m 3&quot; to 2 1/4&quot;.=A0 That helped reduce the noise=A0considerably an=
d I couldn&#39;t detect any reduction in hp.=A0 Or, you could spring for a=
=A0pair=A0of those $800 headsets, or you could do both.=A0 </div>

<div>=A0</div>
<div>Mark S.<br></div>
<div class=3D"gmail_quote">On Sat, Sep 5, 2009 at 10:46 PM, Mike Wills <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:rv-4mike@cox.net">rv-4mike@cox.net</a>&=
gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div bgcolor=3D"#ffffff">
<div><font face=3D"Arial" size=3D"2">Received my DNA muffler this past week=
 and got it installed and running. Havent flown it yet, but have done some =
taxi and full power runups. So far I&#39;m a little disappointed. It doesnt=
 appear to be any quieter than my home made muffler. I&#39;ll reserve judge=
ment until I actually fly it, but from the cockpit the noise level seems th=
e same, and my buddy standing about 50 &#39; away said he thought the noise=
 level was the same.</font></div>

<div><font face=3D"Arial" size=3D"2"></font>=A0</div>
<div><font face=3D"Arial" size=3D"2">=A0One thing not the same - the muffle=
r screwed up my tuning. It appears to be considerably richer now all across=
 the RPM range. And the big bog at the staging point that took me so long t=
o tune out is back with a vengeance. Oddly, in spite of the tune issues it =
still appears to reach the same static RPM as previously.</font></div>

<div><font face=3D"Arial" size=3D"2"></font>=A0</div>
<div><font face=3D"Arial" size=3D"2">=A0Looks like the solution for me is g=
oing to be the high $ headset and the rest of the world is just going to ha=
ve to live with it.</font></div>
<div><font face=3D"Arial" size=3D"2"></font>=A0</div><font color=3D"#888888=
">
<div><font face=3D"Arial" size=3D"2">Mike Wills</font></div>
<div><font face=3D"Arial" size=3D"2">RV-4 N144MW</font></div></font></div><=
/blockquote></div><br>

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