From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Mon, 11 Nov 2019 10:29:49 -0500
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Subject: Re: [FlyRotary] Re: Exhaust setups
To: "Le Roux Breytenbach breytenbachleroux@gmail.com" <flyrotary@lancaironline.net>
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Yes more or less like the coax muffler. Instead of drilling a few holes her=
e and there, I bought a perforated sheet and welded it into a tube. I wante=
d to have it open on both ends, to create a vacuum and help suck the air ou=
t of the cowl. But right now to make flights enjoyable, I might close up th=
e ends and see how that works.

Is anyone running a coax muffler ? Because it's extremely loud in my case.


I did buy the=C2=A0Aero Exhaust AT2525XL and it worked great while doing al=
l my ground testing, but the 6" outer shell was just to big to fit under th=
e plane. Sadly I brought it back home to Canada and haven't flown with it y=
et here in FL. I'll pack it in my suitcase next trip down.

The racing beat presilencer is suppose to be good. I believe it has stainle=
ss steel wool inside and maybe ceramic mat over that. For fun I stuffed cer=
amic mat into the 4" pipe and it did quite things down. Except with the 4" =
tube being open at both ends, it sucked it out. Right now I'm trying to sou=
rce some high temp ss fiber mat to first wrap the pipe, then wrap the ceram=
ic over that, then close up both ends.

1.5minutes into the take off the EGT probe right before the 4" pipe is 1700=
F. =C2=A0 (EGT1 =3D 1768F, EGT2=3D 1819F)

- Matt Boiteau
On 2019-11-11 5:19:37 AM, Le Roux Breytenbach breytenbachleroux@gmail.com <=
flyrotary@lancaironline.net> wrote:
Matt: So the setup for your exhaust, is more or less the one that Paul
Lamar suggest in his forum, 2 years or so ago.?
The coax muffler ?
Le Roux Breytenbach


On Mon, Nov 11, 2019 at 5:38 AM Matt Boiteau mattboiteau@gmail.com
wrote:
>
> What are you guys running for exhaust? The thing is stupid loud and can b=
arely 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 tomorr=
ow.
>
> 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, w=
hich 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
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.ht=
ml

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<div id=3D"__MailbirdStyleContent" style=3D"font-size: 10pt;font-family: Ar=
ial;color: #000000">=0A                                        =0A         =
                               =0A                                         =
   =0A                                        =0A                          =
              =0A                                        Yes more or less l=
ike the coax muffler. Instead of drilling a few holes here and there, I bou=
ght a perforated sheet and welded it into a tube. I wanted to have it open =
on both ends, to create a vacuum and help suck the air out of the cowl. But=
 right now to make flights enjoyable, I might close up the ends and see how=
 that works.<div><br>Is anyone running a coax muffler ? Because it's extrem=
ely loud in my case.<br><br></div><div>I did buy the&nbsp;<span style=3D"fo=
nt-size: 10pt;line-height: 1.5">Aero Exhaust AT2525XL and it worked great w=
hile doing all my ground testing, but the 6" outer shell was just to big to=
 fit under the plane. Sadly I brought it back home to Canada and haven't fl=
own with it yet here in FL. I'll pack it in my suitcase next trip down.</sp=
an></div><div><span style=3D"font-size: 10pt;line-height: 1.5"><br></span><=
/div><div><span style=3D"font-size: 10pt;line-height: 1.5">The racing beat =
p</span><span style=3D"font-size: 10pt">resilencer is suppose to be good. I=
 believe it has stainless steel wool inside and maybe ceramic mat over that=
. For fun I stuffed ceramic mat into the 4" pipe and it did quite things do=
wn. Except with the 4" tube being open at both ends, it sucked it out. Righ=
t now I'm trying to source some high temp ss fiber mat to first wrap the pi=
pe, then wrap the ceramic over that, then close up both ends.</span></div><=
div><span style=3D"font-size: 10pt"><br></span></div><div>1.5minutes into t=
he take off the EGT probe right before the 4" pipe is 1700F. &nbsp; (EGT1 =
=3D 1768F, EGT2=3D 1819F)</div><div><br></div><div class=3D"mb_sig">- Matt =
Boiteau</div>=0A                                        =0A                =
                        <blockquote class=3D"history_container" type=3D"cit=
e" style=3D"border-left-style: solid;border-width: 1px;margin-top: 20px;mar=
gin-left: 0px;padding-left: 10px;min-width: 500px">=0A                     =
   <p style=3D"color: #AAAAAA; margin-top: 10px;">On 2019-11-11 5:19:37 AM,=
 Le Roux Breytenbach breytenbachleroux@gmail.com &lt;flyrotary@lancaironlin=
e.net&gt; wrote:</p><div style=3D"font-family:Arial,Helvetica,sans-serif">M=
att: So the setup for your exhaust, is more or less the one that Paul=0A<br=
>Lamar suggest in his forum, 2 years or so ago.?=0A<br>The coax muffler ?=
=0A<br>Le Roux Breytenbach=0A<br>=0A<br>=0A<br>On Mon, Nov 11, 2019 at 5:38=
 AM Matt Boiteau mattboiteau@gmail.com=0A<br><flyrotary@lancaironline.net> =
wrote:=0A<br>&gt;=0A<br>&gt; What are you guys running for exhaust? The thi=
ng is stupid loud and can barely talk on radio. Headset is LightSpeed wirel=
ess Tango's. Their ANR does not work well with the pitch of the rotary. Wil=
l try a Bose headset tomorrow.=0A<br>&gt;=0A<br>&gt; I have 2.5" exhaust le=
aving the cowl. (ex1.jpg)  It comes down and centers the bottom of the plan=
e into a 4" outer pipe. (ex2.jpg) The 4" outer pipe (5ft long) is open to t=
he 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.=0A<br>&gt;=0A<br>&gt;=0A<br>&gt; - Matt Boiteau=0A<b=
r>&gt; --=0A<br>&gt; Homepage:  http://www.flyrotary.com/=0A<br>&gt; Archiv=
e and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html=
=0A<br>--=0A<br>Homepage:  http://www.flyrotary.com/=0A<br>Archive and UnSu=
b:   http://mail.lancaironline.net:81/lists/flyrotary/List.html=0A<br></fly=
rotary@lancaironline.net></div></blockquote></div>
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