X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4387382 for flyrotary@lancaironline.net; Fri, 09 Jul 2010 22:35:49 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao107.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100710023513.QTUF1969.fed1rmmtao107.cox.net@fed1rmimpo02.cox.net> for ; Fri, 9 Jul 2010 22:35:13 -0400 Received: from willsPC ([174.66.169.177]) by fed1rmimpo02.cox.net with bizsmtp id g2bD1e00H3pzM4m042bDfY; Fri, 09 Jul 2010 22:35:13 -0400 X-VR-Score: -100.00 X-Authority-Analysis: v=1.1 cv=8ImjV4Az/FeJ/TCHtNMSSkPeMQ/82ycixFxo4weeFA8= c=1 sm=1 a=wbKXeunVgZ0A:10 a=+AsylF5sYmrRLEaZ0X9gqA==:17 a=HHGDD-5mAAAA:8 a=zEK_DtS_AAAA:8 a=7g1VtSJxAAAA:8 a=Ia-xEzejAAAA:8 a=ZYIYxYjpOnle2SwjxKQA:9 a=XiHgKq4Y83edyXHjED4A:7 a=INYzssUVW2YekVNOfgY51YKvEmUA:4 a=wPNLvfGTeEIA:10 a=Qa1je4BO31QA:10 a=7tDGjpudKzEA:10 a=i1zE5R4R5dEA:10 a=pGLkceISAAAA:8 a=wPO960Q1ZnZuoRBTICkA:9 a=brcZVlI-GDiJT_rNxx4A:7 a=NgpPa-3PEXrtilRntdziFFs4ym0A:4 a=MSl-tDqOz04A:10 a=EzXvWhQp4_cA:10 a=+AsylF5sYmrRLEaZ0X9gqA==:117 X-CM-Score: 0.00 Message-ID: <3E40A559B54D436AAF4C6A6916D9ABD9@willsPC> From: "Mike Wills" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Mufflers Date: Fri, 9 Jul 2010 19:35:14 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009F_01CB1F9D.DA4591B0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 This is a multi-part message in MIME format. ------=_NextPart_000_009F_01CB1F9D.DA4591B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I may not be Mr. Muffler, but I have a copy of the spiral flow on my 13B = powered RV-4 too. Home made from Inconel, it is holding up OK but = doesn't muffle worth a damn. A friend has a Cobra kit car with spiral = flow sidepipes on a more or less stock 302. They don't work worth a damn = either. After Mark switched to the DNA muffler and reported positive results I = switched too. The DNA was no quieter but cost me some power. So I = switched back. Still looking for the right muffler solution that will = fit in my extremely space limited application without costing too much = power. In my opinion this is the biggest downside with my rotary = install. Mike Wills From: Mark Steitle=20 Sent: Friday, July 09, 2010 2:44 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Mufflers Steve, =20 Yes, that would be me, "Mr. Muffler" himself. The Moroso style muffler = didn't muffle very well and it kept melting the bolt holding the baffle = in place. I finally went with a SS bolt which didn't melt. In an = effort to find something that wasn't as noisy, I discarded it for the = DNA muffler which wasn't much quieter, but it survived the harsh rotary = environment better than anything else I had tried up to that point. I'm = now running an inconel 625 tangential muffler, which is the best as for = noise attenuation I've used to date. The only problem is that I suspect = I'm losing hp due to excess back pressure. But at leaast I can hear to = talk on the radio. Its my opinion at this stage of the game that the = best muffler is a turbo. At least you achieve a fairly quiet exhaust = note, and get some extra hp too. Mark S. On Fri, Jul 9, 2010 at 8:15 AM, Stephen Thomas wrote: I remember some discussion a while back regarding the concept of the = Moroso spin muffler. See: http://moroso.com/catalog/categorydisplay.asp?CatCode=3D35054 Anyone out there still using it? What were the conclusions of those = who tried it? I know someone made one from scratch. I have a small = Burns Stainless muffler that is totally inadequate in terms of sound = attenuation. So, I'm looking for alternatives and remember a lot of = discussion regarding this device. Steve Thomas = ________________________________________________________________________ -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_009F_01CB1F9D.DA4591B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I may not be Mr. Muffler, but I have a copy of = the=20 spiral flow on my 13B powered RV-4 too. Home made from Inconel, it is = holding up=20 OK but doesn=92t muffle worth a damn. A friend has a Cobra kit car with = spiral=20 flow sidepipes on a more or less stock 302. They don=92t work worth a = damn=20 either.
 
After Mark switched to the DNA muffler and = reported=20 positive results I switched too. The DNA was no quieter but cost me some = power.=20 So I switched back. Still looking for the right muffler solution that = will fit=20 in my extremely space limited application without costing too much = power. In my=20 opinion this is the biggest downside with my rotary = install.
 
Mike Wills

Sent: Friday, July 09, 2010 2:44 PM
Subject: [FlyRotary] Re: Mufflers

Steve, =20

Yes, that would be me, "Mr. Muffler" himself.  The Moroso = style=20 muffler didn't muffle very well and it kept melting the bolt holding the = baffle=20 in place.  I finally went with a SS bolt which didn't melt. =  In an=20 effort to find something that wasn't as noisy, I discarded it for the = DNA=20 muffler which wasn't much quieter, but it survived the harsh rotary = environment=20 better than anything else I had tried up to that point.  I'm now = running an=20 inconel 625 tangential muffler, which is the best as for noise = attenuation I've=20 used to date.  The only problem is that I suspect I'm losing hp due = to=20 excess back pressure.  But at leaast I can hear to talk on the = radio.=20  Its my opinion at this stage of the game that the best muffler is = a turbo.=20  At least you achieve a fairly quiet exhaust note, and get some = extra hp=20 too.

Mark S.

On Fri, Jul 9, 2010 at 8:15 AM, Stephen Thomas = <glasair2@me.com>=20 wrote:
I remember some discussion a while back regarding = the=20 concept of the Moroso spin muffler.  See:

http://moroso.com/catalog/categorydisplay.asp?CatCode=3D3= 5054

Anyone=20 out there still using it?  What were the conclusions of those who = tried=20 it?  I know someone made one from scratch.  I have a small = Burns=20 Stainless muffler that is totally inadequate in terms of sound = attenuation.=20  So, I'm looking for alternatives and remember a lot of = discussion=20 regarding this device.


Steve=20 = Thomas
_______________________________________________________________= _________




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