X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from blu0-omc2-s19.blu0.hotmail.com ([65.55.111.94] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3754344 for flyrotary@lancaironline.net; Sun, 12 Jul 2009 06:29:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.55.111.94; envelope-from=neilak@sympatico.ca Received: from BLU0-SMTP19 ([65.55.111.73]) by blu0-omc2-s19.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Sun, 12 Jul 2009 03:29:21 -0700 X-Originating-IP: [76.69.1.47] X-Originating-Email: [neilak@sympatico.ca] Message-ID: Return-Path: neilak@sympatico.ca Received: from NeilPC ([76.69.1.47]) by BLU0-SMTP19.blu0.hotmail.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Sun, 12 Jul 2009 03:29:19 -0700 From: To: "'Rotary motors in aircraft'" In-Reply-To: Subject: RE: [FlyRotary] Re: Flowmaster Hushpower Report Date: Sun, 12 Jul 2009 06:28:22 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D7_01CA02B9.F54AB640" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcoCrmSr3nNt/zdpSKW1YiwB1iAhKAAKaFeA X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 X-OriginalArrivalTime: 12 Jul 2009 10:29:19.0833 (UTC) FILETIME=[9D948490:01CA02DB] This is a multi-part message in MIME format. ------=_NextPart_000_00D7_01CA02B9.F54AB640 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, =20 I tried a Swiss muffler many moons ago. I work great=85 = for about 10 mins. The packing quickly disintegrated and spit out the tail pipe. I tried every type of packing material I could think of. = Ceramic, Glass fibre, Carbon fibre Stainless steel wool, and mixes. I tried replacing the wire mesh inner tube with SS tubing drilled full of holes. = I tried donut shaped baffle plates trying to hold the packing in place. Nothing worked for more than =BD hour. Between the heat and the strong exhaust pulse the rotary makes, none of the packing material had the mechanical properties to hold up. The best material I found for packing = was carbon fibre, but again, it didn=92t last long enough but for a circuit = or two. =20 On the plus side, the sound this muffler makes was music to = the ear (for the first 15 mins at least). =20 =20 Neil K =20 PS: I had a look through the archives but they don=92t go back far = enough for my original posts. =20 _____ =20 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 =20 Has anybody ever tried one of these on a rotary? If you are going to = hang one outside it wouldn=92t be any more draggy than one that was =93ready = rolled=94. =20 http://www.piteraq.dk/flight/muffler.html =20 Bill B =20 _____ =20 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,=20 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. =20 =20 Mark S. =20 On Sat, Jul 11, 2009 at 9:42 PM, Mike Wills wrote: Dave, =20 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. =20 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. =20 Mike Wills =20 RV-4 N144MW ----- Original Message -----=20 From: David Leonard=20 To: Rotary motors in aircraft =20 Sent: Thursday, July 09, 2009 7:38 PM Subject: [FlyRotary] Flowmaster Hushpower Report =20 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. =20 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=3D35054 =20 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. =20 Will report back in 2 years on its performance :-) --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net =20 http://RotaryRoster.net =20 =20 ------=_NextPart_000_00D7_01CA02B9.F54AB640 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Bill,

 

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 I = tried a Swiss muffler many moons ago. =A0I work great…=A0 for about 10 mins. =A0The packing = quickly disintegrated and spit out the tail pipe.=A0 I tried every type of packing material I = could think of.=A0 Ceramic, Glass fibre, Carbon fibre Stainless steel wool, = and mixes.=A0 I tried replacing the wire mesh inner tube with SS tubing drilled full = of holes. =A0I tried donut shaped baffle plates trying to hold the packing = in place. =A0Nothing worked for more than =BD hour.=A0 Between the heat and the = strong exhaust pulse the rotary makes, none of the packing material had the mechanical properties to hold up. =A0The best material I found for packing was = carbon fibre, but again, it didn’t last long enough but for a circuit or = two.

 

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 = On the plus side, the sound this muffler makes was music to the ear (for the first 15 mins at least). = =A0

 

Neil K

 

PS: I had a look through the = archives but they don’t go back far enough for my original = posts.

 

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

 

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