X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=H+OlPNQi c=1 sm=1 tr=0 a=p3QOco+7hGoYrtPqiBtjvA==:117 a=ivo9DYz+79RwUUcBUptMSg==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=x7bEGLp0ZPQA:10 a=K7ySfSCCDxUA:10 a=MeAgGD-zjQ4A:10 a=o1OHuDzbAAAA:8 a=Ia-xEzejAAAA:8 a=pGLkceISAAAA:8 a=7g1VtSJxAAAA:8 a=RS4DCX6NGDMbuIzjrIoA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=4PR2P7QzAAAA:8 a=GyP-zp79JxzVaWVmXgEA:9 a=5vLtBdFMlNPoUoQS:21 a=5YQ6H4ZxyGn-KoBYtt8s:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 a=4dqwQCo7Po2mVW515mGf:22 From: "Matt Boiteau mattboiteau@gmail.com" Received: from mail-ua1-f43.google.com ([209.85.222.43] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 13165711 for flyrotary@lancaironline.net; Mon, 11 Nov 2019 18:41:07 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.222.43; envelope-from=mattboiteau@gmail.com Received: by mail-ua1-f43.google.com with SMTP id s25so4153784uap.1 for ; Mon, 11 Nov 2019 15:41:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:date:message-id:subject:from:to:in-reply-to:references :user-agent; bh=YQ5YDQyTcOsQJtaUXHFCe2FPEUslzu4q4yTNmZRwje0=; b=Fp6kJdO54IDrmwXcsoL0uI43gaKxldJxpm1h8VUrvEX7a2zbg4kTpr+9WJX2zpqOHe OV48Kf8FXbLJPCZdeuqNPl5RJPnoUuFvMwq37cHncifk/6qWpdu5UbRblVZciHXxovBM p7s/6bnR8gdQAqw0tqVyi3Xq88tN9MFo4EM+v2bAC9y8KrGTJU3LlqAn5G27odHOJqsW zOaOa87v0BayjBTdXN9/zHX2aPz9P5Ig3dT3fS8QED6qOLHhoVw1tFxgHPLCGIQY61Fp JhXftuBodtYa30M7HuR4wRxLqfSr90UiO4AOG8yAy5SIRPS0YrJbXezrLNGDyS1D9B6l 3dMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :in-reply-to:references:user-agent; bh=YQ5YDQyTcOsQJtaUXHFCe2FPEUslzu4q4yTNmZRwje0=; b=B0DxTApBE74DoWiqrKC4qAP4NRQeDsJnOvJ3CDlvGohgnztdg4tM0wFKAV8a8rLY3K Vc6cfTB2jBae5qL1a6syCcKjn25yGlNCMT+7S6B24AIACAdBQoQfwuj6ElsKge7nV4TJ jiK8GfmbB0cAbLMrFmIuMVO1nrX6rMlAlIn3O8Kn6LdSyndgfDlFmR7gdmWsUWgZDusm b0oK3Li1x6kiVNkKQz9XJZRXHpWHOw5YVpanKlkw9yzpnHQ7u0aIkkwK9HbV3K0sTpeI eBbvvUSSyEX+ELdPsqGzUaS4YlK0b6z7cY9GRTlYwU1dpGTvSrcKNQ07zUDQWy9PsJI0 kHMA== X-Gm-Message-State: APjAAAXVfFwVBkHsZIpD3hyHT080ZuZ+CA3Ine+LVF6PUpb3rR1g0kTJ JM6J/V226YOArTZT51qYNy4w4P8hqoM7vQ== X-Google-Smtp-Source: APXvYqxtkyRrR/ePJ49gYc0rmUHl5BL8H8/t5zkvusHhXk72nq5KH8w/JXLNJQeGtHyy2eMFGckHvA== X-Received: by 2002:ab0:786:: with SMTP id c6mr18591264uaf.62.1573515648564; Mon, 11 Nov 2019 15:40:48 -0800 (PST) Return-Path: Received: from [192.168.0.151] ([71.214.35.56]) by smtp.gmail.com with ESMTPSA id d124sm4443435vkg.51.2019.11.11.15.40.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Nov 2019 15:40:47 -0800 (PST) Content-Type: multipart/alternative; boundary="----=_NextPart_26473348.497421555497" MIME-Version: 1.0 Date: Mon, 11 Nov 2019 18:40:46 -0500 Message-ID: <0a4ad993-0db7-4cff-8e30-e5936481f3b3@getmailbird.com> Subject: Re: [FlyRotary] Re: Exhaust setups To: "Neil Unger 12348ung@gmail.com" In-Reply-To: References: User-Agent: Mailbird/2.5.43.0 X-Mailbird-ID: 0a4ad993-0db7-4cff-8e30-e5936481f3b3@getmailbird.com ------=_NextPart_26473348.497421555497 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Finn, do you have any pictures? - Matt Boiteau On 2019-11-11 2:39:52 PM, Finn Lassen finn.lassen@verizon.net wrote: No, it's simply a 2.5" tube welded onto the outlet of the Hushpower "muffle= r". If I remember correctly, the innards of the Hushpower muffler were all blow= n out when I did this. But the key to noise reduction in the cockpit seems = to be to get the exhaust pointed away from the cockpit. Granted, probably d= oesn't do much for people on or near the airport :) Yes, it may increase drag to have the plume(s) pointed down instead of aft.= I didn't try to measure that. Finn On 11/11/2019 12:40 PM, Matt Boiteau mattboiteau@gmail.com [mailto:mattboit= eau@gmail.com] wrote: It's behind the rear bulkhead by a ft or so. The perforated store bought sh= eet is extremely holey, found in typical mufflers. I do have a 4ft 2.5" sol= id tube I bought just incase i drill my own holes. Is your exhaust tube inside a surrounding tube? Or you just extended the cu= rrent exhaust (2.5" or 3"?) 3 ft more, capped off the end of it? - Matt Boiteau On Mon, Nov 11, 2019, 11:20 Finn Lassen finn.lassen@verizon.net [mailto:fin= n.lassen@verizon.net] wrote: On?? my RV-3B I added a 3' long pipe with 1/8" holes drilled in the bottom = of it (faced down). Tube closed at the end. Area of the 1/8" holes add up t= o the cross section are of the tube. That did reduce the noise in the cockpit noticeably. Is your final exit well behind the cockpit? If so, the sound must be transm= itted through the surrounding (outer) pipe. Finn On 11/11/2019 10:29 AM, Matt Boiteau mattboiteau@gmail.com [mailto:mattboit= eau@gmail.com] wrote: 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??Aero Exhaust AT2525XL and it worked great while doing all my= ground testing, but the 6" outer shell was just to big to fit under the pl= ane. Sadly I brought it back home to Canada and haven't flown with it yet h= ere 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. ?? (EGT1 =3D 1768F, EGT2=3D 1819F) - Matt Boiteau On 2019-11-11 5:19:37 AM, Le Roux Breytenbach breytenbachleroux@gmail.com [= mailto:breytenbachleroux@gmail.com] [mailto:f= lyrotary@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 [mailto:= 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/ [http://www.flyrotary.com/] > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.= html [http://mail.lancaironline.net:81/lists/flyrotary/List.html] -- Homepage: http://www.flyrotary.com/ [http://www.flyrotary.com/] Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.ht= ml [http://mail.lancaironline.net:81/lists/flyrotary/List.html] ------=_NextPart_26473348.497421555497 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Finn, do you have any pictures?
- Matt Boiteau

On 2= 019-11-11 2:39:52 PM, Finn Lassen finn.lassen@verizon.net <flyrotary@lan= caironline.net> wrote:

No, it's simply a 2.5" tube welded onto the outlet of the Hushpower "muffler".

If I remember correctly, the innards of the Hushpower muffler were all blown out when I did this. But the key to noise reduction in the cockpit seems to be to get the exhaust pointed away from the cockpit. Granted, probably doesn't do much for people on or near the airport :)

Yes, it may increase drag to have the plume(s) pointed down instead of aft. I didn't try to measure that.

Finn


On 11/11/2019 12:40 PM, Matt Boiteau mattboiteau@gmail.com wrote= :
It's behind the rear bulkhead by a ft or so. The perforated store bought sheet is extremely holey, found in typical mufflers. I do have a 4ft 2.5" solid tube I bought just incase i drill my own holes.

Is your exhaust tube inside a surrounding tube? Or you just extended the current exhaust (2.5" or 3"?) 3 ft more, capped off the end of it?

- Matt Boiteau

On Mon, Nov 11, 2019, 11:20 Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironli= ne.net> wrote:
On?? my RV-3B I added a 3' long pipe with 1/8" holes drilled in the bottom of it (faced down). Tube closed at the end. Area of the 1/8" holes add up to the cross section are of the tube.
That did reduce the noise in the cockpit noticeably.

Is your final exit well behind the cockpit? If so, the sound must be transmitted through the surrounding (outer) pipe.

Finn

On 11/11/2019 10:29 AM, Matt Boiteau mattboiteau@gmail.com wrote:
Yes more or le= ss like the coax muffler. Instead of drilling a few holes here and there, I bought 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.

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

I did buy the??Aero Exhaust AT2525XL and it worked great while 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 flown with it yet here in FL. I'll pack it in my suitcase next trip down.
<= br>
T= he racing beat presilencer 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 down. Except with the 4" tube being open at both ends, it sucked it out. Right now I'm trying to source some high temp ss fiber mat to first wrap the pipe, then wrap the ceramic over that, then close up both ends.

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

- Matt Boiteau

On 2019-11-11 5:19:37 AM, Le Roux Breytenbach breytenbachleroux@gmail.com <flyrotary@lan= caironline.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 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/flyro= tary/List.html
--
Homepage: http://www.flyro= tary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/= List.html



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