X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3754391 for flyrotary@lancaironline.net; Sun, 12 Jul 2009 08:08:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta01.mail.rr.com with ESMTP id <20090712120752832.XIMH21440@cdptpa-omta01.mail.rr.com> for ; Sun, 12 Jul 2009 12:07:52 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Flowmaster Hushpower Report Date: Sun, 12 Jul 2009 08:07:55 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0012_01CA02C7.DC8D84D0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: AcoCrl/m4w0Yeu82QIW7n303c8dJlQAOpEZA In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20090712120752832.XIMH21440@cdptpa-omta01.mail.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_0012_01CA02C7.DC8D84D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Yes, Bill My suggestion is don't waste your time. Perhaps with substitutes of material it might could be make to work for a short time. However, I have not yet seen a muffler using any sort of absorb material (including ceramic wool which I tried - withstood the heat fine, but not the pulse) that can withstand the shock wave of the rotary exhaust. Whether stainless steel, fiberglass, ceramic, etc, etc, can all withstand the heat, within a few weeks the exhaust pulse has pulverized the absorbent material and blown it out the exhaust. The ones that seem to last the longest are the acoustic baffle type. YMMW Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry Sent: Sunday, July 12, 2009 1:05 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Flowmaster Hushpower Report Has anybody ever tried one of these on a rotary? If you are going to hang one outside it wouldn't be any more draggy than one that was "ready rolled". http://www.piteraq.dk/flight/muffler.html Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle Sent: Saturday, July 11, 2009 11:47 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Flowmaster Hushpower Report Mike, For my first muffler attempt, I copied the spiral flow design for my 20B. While it worked (passed gas), I wouldn't call it quiet, and neither did my airport neighbors. Mark S. On Sat, Jul 11, 2009 at 9:42 PM, Mike Wills wrote: Dave, My "muffler" is a copy of this design. Except its made of Inconel. Unfortunately it doesnt really serve its intended purpose of muffling as you know. Could be my implementation as the center tube diameter could be too large. I expect it will still be holding up just fine when I replace it because it doesnt muffle. I'm thinking of trying the DNA muffler next pending Mark's final results. One more data point. My buddy has a Cobra kit car with Ford 302 V8. His side pipes also use the spiral flow design. The external pipe is 4" diameter, the internal is less than 1". So presumably a large percentage of the flow goes through the spiral. But his car is still pretty loud. Mike Wills RV-4 N144MW ----- Original Message ----- From: David Leonard To: Rotary motors in aircraft Sent: Thursday, July 09, 2009 7:38 PM Subject: [FlyRotary] Flowmaster Hushpower Report For the last couple hundred hours I have been using a Flowmaster Hushpower II muffler. Also used by Tracy and some others I think. It is done. The outside held up wery well, but I reciently removed it and discovered that the insides have entirely disientigrated. Whatever they used as packing has turned to a heavy clay-like substance ratteling around in the bottom. She steel mesh is in pieces. I had been thinking that the plane was not as quiet as it seemed 2 years ago.. go figure. So I was thinking about one of the DNA Mufflers someone mentioned. They seemed nice because there is no packing, just steel dividers. Unfortunately, it is a little to big around to fit in my current set up. Instead, I ordered this muffler that also has steel innards but no packing: http://www.moroso.com/catalog/categorydisplay.asp?catcode=35054 It is nice because it is going to be smaller and lighter than the flowmaster (or the DNA), as well as less expensive - even the SS version that I ordered. Will report back in 2 years on its performance :-) -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_0012_01CA02C7.DC8D84D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Yes, = Bill

 

My suggestion is don’t waste = your time.  Perhaps with substitutes of material it might could be make = to work for a short time.  However, I have not yet seen a muffler using any = sort of absorb material (including ceramic wool which I tried – = withstood the heat fine, but not the pulse) that can withstand the shock wave of the = rotary exhaust.  Whether stainless steel, fiberglass, ceramic, etc, etc, = can all withstand the heat, within a few weeks the exhaust pulse has pulverized = the absorbent material and blown it out the exhaust.  The ones that = seem to last the longest are the acoustic baffle type.  = YMMW

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Sunday, July 12, = 2009 1:05 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Flowmaster Hushpower Report

 

Has anybody ever tried one of these on a rotary?  If you = are going to hang one outside it wouldn’t be any more draggy than one that = was “ready rolled”.

 

 http://www.piteraq.dk/= flight/muffler.html

 

Bill B

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Saturday, July 11, = 2009 11:47 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Flowmaster Hushpower Report

Mike,

For my first muffler attempt, I copied the spiral flow = design for my 20B.  While it worked (passed gas), I wouldn't call it quiet, = and neither did my airport neighbors.  =

 

Mark S.



 

On Sat, Jul 11, 2009 at 9:42 PM, Mike Wills <rv-4mike@cox.net> = wrote:

Dave,

 

My "muffler" is a copy of this design. = Except its made of Inconel. Unfortunately it doesnt really serve its intended = purpose of muffling as you know. Could be my implementation as the center tube = diameter could be too large. I expect it will still be holding up just fine when = I replace it because it doesnt muffle. I'm thinking of trying the DNA = muffler next pending Mark's final results.

 

One more data point. My buddy has a Cobra kit car = with Ford 302 V8. His side pipes also use the spiral flow design. The external = pipe is 4" diameter, the internal is less than 1". So presumably a = large percentage of the flow goes through the spiral. But his car is still = pretty loud.

 

Mike Wills

 

RV-4 N144MW

----- Original Message ----- =

Sent: = Thursday, July 09, 2009 7:38 PM

Subject: = [FlyRotary] Flowmaster Hushpower Report

 

For the last couple hundred hours I have been using a Flowmaster Hushpower II muffler.  Also used by Tracy and some others I = think.  It is done.  The outside held up wery well, but I reciently removed = it and discovered that the insides have entirely disientigrated.  Whatever = they used as packing has turned to a heavy clay-like substance ratteling = around in the bottom.  She steel mesh is in pieces.  I had been thinking that the plane was not as quiet as it seemed 2 years = ago..  go figure.

 

So I was thinking about one of the DNA Mufflers someone mentioned.  They seemed nice because there is no packing, just = steel dividers.  Unfortunately, it is a little to big around to fit in my current set up.   Instead, I ordered this muffler that = also has steel innards but no packing:

 

It is nice because it is going to be smaller and lighter than = the flowmaster (or the DNA), as well as less expensive - even the SS version = that I ordered.

 

Will report back in 2 years on its performance  :-)


--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

 



__________ Information from ESET NOD32 Antivirus, version of virus = signature database 3267 (20080714) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

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