From: "Andrew Martin andrew@martinag.com.au" <flyrotary@lancaironline.net>
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Date: Mon, 11 Nov 2019 13:56:18 +0800
Message-ID: <CAJxaVD1rw253_iHhX_iJH4Du=b0HoLb7erqh7wEF95b1GMnjFw@mail.gmail.com>
Subject: Re: [FlyRotary] Exhaust setups
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Matt. Did I read that right. Your 4" tube is open at the end? Would that
not make it try to emulate a trumpet.
I would close the outlet end completely then cut an outlet in the 4" at the
inlet end. You end up with a very effective Schertz pipe exhaust.

On Mon, 11 Nov. 2019, 11:38 am 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"auto">Matt. Did I read that right. Your 4&quot; tube is open at=
 the end? Would that not make it try to emulate a trumpet.<div dir=3D"auto"=
>I would close the outlet end completely then cut an outlet in the 4&quot; =
at the inlet end. You end up with a very effective Schertz pipe exhaust.</d=
iv></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_att=
r">On Mon, 11 Nov. 2019, 11:38 am Matt Boiteau <a href=3D"mailto:mattboitea=
u@gmail.com">mattboiteau@gmail.com</a>, &lt;<a href=3D"mailto:flyrotary@lan=
caironline.net">flyrotary@lancaironline.net</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div id=3D"m_-5396005175457497739__MailbirdStyleCon=
tent" style=3D"font-size:10pt;font-family:Arial;color:#000000">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><b=
r></div><div>I have 2.5&quot; exhaust leaving the cowl. (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 exit=
s 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 b=
lew all out.</div><div><br></div><div><div><div><br></div><div>- Matt Boite=
au</div></div></div></div>--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer nor=
eferrer" target=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 noreferrer" target=3D"_blank">=
http://mail.lancaironline.net:81/lists/flyrotary/List.html</a><br>
</blockquote></div>

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