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Date: Mon, 12 Jul 2010 15:12:01 -0700
Message-ID: <AANLkTil1x3wEwiFGZzFrHV-lsdDqPG3I0OPITZulHaa4@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Mufflers
From: Todd Bartrim <bartrim@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=0016e6475b08c23d07048b380aca

--0016e6475b08c23d07048b380aca
Content-Type: text/plain; charset=ISO-8859-1

Hi Dwayne;
When making changes to your muffler it would be nice to have a decibel meter
to get a measurement. These can be found on ebay for reasonable prices,
however I also found a free app called DeciBell for my android phone. It
seems to work great and while I don't have a lot of confidence in it's
accuracy compared to a professional quality meter, it will allow you to make
some meaningfull before and after measurements when making changes. Attached
is a screen shot of the app. This app is in the android market and may also
be available for iphone.
I realize that not everyone has a smartphone, but I know of a heck of a lot
more people that have smartphones, than I know with decibel meters, so if
have one or have a friend with one and can get him to install the app then
it's a handy tool to make a quantitative measurement of the effect of your
changes.

Todd Bartrim

On 2010-07-12 2:42 PM, "Dwayne Parkinson" <dwayneparkinson@yahoo.com> wrote:

That's very interesting.  Thanks for the info.

________________________________
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircra...
*Sent:* Mon, July 12, 2010 10:58:42 AM
*Subject:* [FlyRotary] Re: Mufflers


Dwayne,

I added a cone-shaped 3" to 2.5" reducer to the exit of my DNA muffler to
try and quiet i...

--0016e6475b08c23d07048b380aca
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<p>Hi Dwayne;<br>
	When making changes to your muffler it would be nice to have a decibel met=
er to get a measurement. These can be found on ebay for reasonable prices, =
however I also found a free app called DeciBell for my android phone. It se=
ems to work great and while I don&#39;t have a lot of confidence in it&#39;=
s accuracy compared to a professional quality meter, it will allow you to m=
ake some meaningfull before and after measurements when making changes. Att=
ached is a screen shot of the app. This app is in the android market and ma=
y also be available for iphone.<br>

	I realize that not everyone has a smartphone, but I know of a heck of a lo=
t more people that have smartphones, than I know with decibel meters, so if=
 have one or have a friend with one and can get him to install the app then=
 it&#39;s a handy tool to make a quantitative measurement of the effect of =
your changes. </p>

<p>Todd Bartrim</p>
<p><blockquote type=3D"cite">On 2010-07-12 2:42 PM, &quot;Dwayne Parkinson&=
quot; &lt;<a href=3D"mailto:dwayneparkinson@yahoo.com" target=3D"_blank">dw=
ayneparkinson@yahoo.com</a>&gt; wrote:<br><br><div><div style=3D"font-famil=
y:arial, helvetica, sans-serif;font-size:10pt">

<div>That&#39;s very interesting. =A0Thanks for the info.</div><div style=
=3D"font-family:arial, helvetica, sans-serif;font-size:10pt"><br><div style=
=3D"font-family:times new roman, new york, times, serif;font-size:12pt"><fo=
nt size=3D"2" face=3D"Tahoma"><p>

<font color=3D"#500050">________________________________<br>From: Mark Stei=
tle &lt;<a href=3D"mailto:msteitle@gmail.com" target=3D"_blank">msteitle@gm=
ail.com</a>&gt;<br>To: Rotary motors in aircra...</font></p><b><span style=
=3D"font-weight:bold">Sent:</span></b> Mon, July 12, 2010 10:58:42 AM<br>

<b><span style=3D"font-weight:bold">Subject:</span></b> [FlyRotary] Re: Muf=
flers<br></font><p><font color=3D"#500050"><br>Dwayne,<br>=A0<br>I added a =
cone-shaped 3&quot; to 2.5&quot; reducer to the exit of my DNA muffler to t=
ry and quiet i...</font></p>

</div></div><div></div>


</div><br>

      </div></blockquote></p>

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