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Date: Fri, 9 Jul 2010 16:44:19 -0500
Message-ID: <AANLkTik5Ig9_EFnBaMRRR4_5lYSODX3dOIdHrfdz8uWo@mail.gmail.com>
Subject: Re: [FlyRotary] Mufflers
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=0016e644df0a2ee92c048afb4e87

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Steve,

Yes, that would be me, "Mr. Muffler" himself.  The Moroso style muffler
didn't muffle very well and it kept melting the bolt holding the baffle in
place.  I finally went with a SS bolt which didn't melt.  In an effort to
find something that wasn't as noisy, I discarded it for the DNA muffler
which wasn't much quieter, but it survived the harsh rotary environment
better than anything else I had tried up to that point.  I'm now running an
inconel 625 tangential muffler, which is the best as for noise attenuation
I've used to date.  The only problem is that I suspect I'm losing hp due to
excess back pressure.  But at leaast I can hear to talk on the radio.  Its
my opinion at this stage of the game that the best muffler is a turbo.  At
least you achieve a fairly quiet exhaust note, and get some extra hp too.

Mark S.

On Fri, Jul 9, 2010 at 8:15 AM, Stephen Thomas <glasair2@me.com> wrote:

> I remember some discussion a while back regarding the concept of the Moroso
> spin muffler.  See:
>
> http://moroso.com/catalog/categorydisplay.asp?CatCode=35054
>
> Anyone out there still using it?  What were the conclusions of those who
> tried it?  I know someone made one from scratch.  I have a small Burns
> Stainless muffler that is totally inadequate in terms of sound attenuation.
>  So, I'm looking for alternatives and remember a lot of discussion regarding
> this device.
>
>
> Steve Thomas
> ________________________________________________________________________
>
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

--0016e644df0a2ee92c048afb4e87
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Steve,=A0<div><br></div><div>Yes, that would be me, &quot;Mr. Muffler&quot;=
 himself. =A0The Moroso style muffler didn&#39;t muffle very well and it ke=
pt melting the bolt holding the baffle in place. =A0I finally went with a S=
S bolt which didn&#39;t melt. =A0In an effort to find something that wasn&#=
39;t as noisy, I discarded it for the DNA muffler which wasn&#39;t much qui=
eter, but it survived the harsh rotary environment better than anything els=
e I had tried up to that point. =A0I&#39;m now running an inconel 625 tange=
ntial muffler, which is the best as for noise attenuation I&#39;ve used to =
date. =A0The only problem is that I suspect I&#39;m losing hp due to excess=
 back pressure. =A0But at leaast I can hear to talk on the radio. =A0Its my=
 opinion at this stage of the game that the best muffler is a turbo. =A0At =
least you achieve a fairly quiet exhaust note, and get some extra hp too.</=
div>
<div><br></div><div>Mark S.<br><br><div class=3D"gmail_quote">On Fri, Jul 9=
, 2010 at 8:15 AM, Stephen Thomas <span dir=3D"ltr">&lt;<a href=3D"mailto:g=
lasair2@me.com">glasair2@me.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex;">
I remember some discussion a while back regarding the concept of the Moroso=
 spin muffler. =A0See:<br>
<br>
<a href=3D"http://moroso.com/catalog/categorydisplay.asp?CatCode=3D35054" t=
arget=3D"_blank">http://moroso.com/catalog/categorydisplay.asp?CatCode=3D35=
054</a><br>
<br>
Anyone out there still using it? =A0What were the conclusions of those who =
tried it? =A0I know someone made one from scratch. =A0I have a small Burns =
Stainless muffler that is totally inadequate in terms of sound attenuation.=
 =A0So, I&#39;m looking for alternatives and remember a lot of discussion r=
egarding this device.<br>

<br>
<br>
Steve Thomas<br>
________________________________________________________________________<br=
><font color=3D"#888888">
<br>
<br>
<br>
<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>
</font></blockquote></div><br></div>

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