From: "William Jepson wrjjrs@gmail.com" <flyrotary@lancaironline.net>
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Date: Sun, 10 Nov 2019 20:42:12 -0800
Message-ID: <CAN=mtadie+MTrGr6_0nS9BVvEzhp77faA-eys1pj9=2wBqaZSg@mail.gmail.com>
Subject: Re: [FlyRotary] Exhaust setups
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Matt, and others,
Powersport had good luck with a flowmaster medium square can muffler, but
they cut it open and replaced the baffles with inconel to handle the heat.
The suggestion was to use a muffler that has at lease 2X the swept volume
of the engine in the primary chamber.. This does help with the noise and
lasted pretty well. Be sure your welder is good. This muffler helps in two
ways it lowers the tone and lessens the volume. As an arunning  Mlternate
look up the Iannetti Patent. He made mufflers for the IMSA guys and they
worked great. In fact at first he would only lease the muffler to the
various teams running Mazdas.
Bill

On Sun, Nov 10, 2019 at 7:38 PM Matt Boiteau mattboiteau@gmail.com <
flyrotary@lancaironline.net> wrote:

> What are you guys running for exhaust? The thing is stupid loud and can
> barely talk on radio. Headset is LightSpeed wireless Tango's. Their ANR
> does not work well with the pitch of the rotary. Will try a Bose headset
> tomorrow.
>
> I have 2.5" exhaust leaving the cowl. (ex1.jpg)  It comes down and centers
> the bottom of the plane into a 4" outer pipe. (ex2.jpg) The 4" outer pipe
> (5ft long) is open to the free air and exits behind the rear bulkhead. The
> 2.5" converts to a 3ft long perforated pipe (ex3.jpg) and exits inside the
> 4" outer pipe. For fun, I filled it full of ceramic fiber insulation mat,
> which did help a little until it blew all out.
>
>
> - Matt Boiteau
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div dir=3D"ltr">Matt, and others,<div>Powersport had good luck with a flow=
master medium square can muffler, but they cut it open and replaced the baf=
fles with inconel to handle the heat. The suggestion was to use a muffler t=
hat has at lease 2X the swept volume of the engine in the primary chamber..=
 This does help with the noise and lasted pretty well. Be sure your welder =
is good. This muffler helps in two ways it lowers the tone and lessens the =
volume. As an arunning=C2=A0 Mlternate look up the Iannetti Patent. He made=
 mufflers for the IMSA guys and they worked great. In fact at first he woul=
d only lease the muffler to the various teams running Mazdas.</div><div>Bil=
l</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Sun, Nov 10, 2019 at 7:38 PM Matt Boiteau <a href=3D"mailto:mattb=
oiteau@gmail.com" target=3D"_blank">mattboiteau@gmail.com</a> &lt;<a href=
=3D"mailto:flyrotary@lancaironline.net" target=3D"_blank">flyrotary@lancair=
online.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div id=3D"gmail-m_-4358500582911805133gmail-m_-7615376386134270=
466__MailbirdStyleContent" style=3D"font-size:10pt;font-family:Arial;color:=
rgb(0,0,0)">What are you guys running for exhaust? The thing is stupid loud=
 and can barely talk on radio. Headset is LightSpeed wireless Tango&#39;s. =
Their ANR does not work well with the pitch of the rotary. Will try a Bose =
headset tomorrow.<div><br></div><div>I have 2.5&quot; exhaust leaving the c=
owl. (ex1.jpg) =C2=A0It comes down and centers the bottom of the plane into=
 a 4&quot; outer pipe. (ex2.jpg) The 4&quot; outer pipe (5ft long) is open =
to the free air and exits behind the rear bulkhead. The 2.5&quot; converts =
to a 3ft long perforated pipe (ex3.jpg) and exits inside the 4&quot; outer =
pipe. For fun, I filled it full of ceramic fiber insulation mat, which did =
help a little until it blew all out.</div><div><br></div><div><div><div><br=
></div><div>- Matt Boiteau</div></div></div></div>--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer" target=3D"_blank">http://mail=
.lancaironline.net:81/lists/flyrotary/List.html</a><br>
</blockquote></div>

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