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To: flyrotary@lancaironline.net
Subject: Sound Level Testing
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I bought a Wensn 30-130 Decibel sound meter off fleabay. I use it to record=
 sound levels in front of my face in flight.
 I first tested my RV-8 after installing a turn down tip, but was also expe=
riencing  severe exhaust leaks from my turbo: 19.7 DBa=20
After fixing the leak, I recorded 16.8 DBa
Then I squeezed the turn down tip to a flattened rectangle opening, and rep=
laced the lost area with 1/4" holes, which I bent to face backwards with a =
Philips screwdriver. a Piccolo Pipe, as it's known. Kind of a cheese grater=
 for sound waves. Next reading: 14.6 DBa
This is still to loud for my worn out ears, so I bought an Aeroturbine 2525=
 muffler, as described on this forum. I've been collecting 304 stainless pi=
pe bend, ball joints clamps and hangers. I hope to get something cobbled to=
gether this weekend.
I have a 2" exhaust pipe from the turbo which discharges aft. The pipe has =
2 90 degree bends and exhausts in and parallel to the exit air ramp on the =
bottom. I plan to use the Ford type exhaust hangers with 3/8" rods.



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<div style=3D"color: black; font-family: arial,helvetica; font-size: 10pt;"=
><font color=3D"black" face=3D"arial" size=3D"2">

<div style=3D"color: black; font-family: arial,helvetica; font-size: 10pt;"=
>


<div id=3D"AOLMsgPart_1_ca5701d9-d5e3-4f3c-92b5-39e0365d57ab">
<font color=3D"black" face=3D"arial" size=3D"2">


<div><font style=3D"background-color: transparent;">I bought a Wensn 30-130=
 Decibel sound meter off fleabay. I use it to record sound levels in front =
of my face in flight.</font></div>





<div><font style=3D"background-color: transparent;">&nbsp;I first tested my=
 RV-8 after installing a turn down tip, but was also experiencing&nbsp; sev=
ere exhaust leaks from my turbo: 19.7 DBa&nbsp;</font></div>





<div>After fixing the leak, I recorded 16.8 DBa</div>





<div>Then&nbsp;I squeezed the turn down tip to a flattened rectangle openin=
g, and replaced the lost area with 1/4" holes, which I bent to face backwar=
ds with a Philips screwdriver.&nbsp;a Piccolo Pipe, as it's known. Kind of =
a cheese grater for sound waves. Next reading: 14.6 DBa</div>





<div>This is still to loud for my worn out ears, so I bought an Aeroturbine=
 2525 muffler, as described on this forum. I've been collecting 304 stainle=
ss pipe bend, ball joints clamps and hangers. I hope to get something cobbl=
ed together this weekend.</div>





<div>I have a 2" exhaust pipe from the turbo which discharges aft. The pipe=
 has 2 90 degree bends and exhausts in and parallel to the exit air ramp on=
 the bottom.&nbsp;I plan to use the Ford type exhaust hangers with 3/8" rod=
s.<a href=3D"http://mail.aol.com/38380-111/aol-6/en-us/mail/get-attachment.=
aspx?uid=3D30479322&amp;folder=3DOldMail&amp;partId=3D1" target=3D"_blank">=
<img class=3D"AOLAttachedImage" style=3D"border: 1px solid rgb(218, 218, 21=
4); width: 275px; height: 205px; margin-bottom: 30px; visibility: visible; =
cursor: pointer;" src=3D"http://mail.aol.com/38380-111/aol-6/en-us/mail/get=
-attachment.aspx?uid=3D30479322&amp;folder=3DOldMail&amp;partId=3D1" filena=
me=3D"photo.JPG" partid=3D"1"><br>
</a></div>


</font>
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