X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3754201 for flyrotary@lancaironline.net; Sat, 11 Jul 2009 22:43:14 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao105.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20090712024238.WISW20430.fed1rmmtao105.cox.net@fed1rmimpo02.cox.net> for ; Sat, 11 Jul 2009 22:42:38 -0400 Received: from wills ([68.105.87.229]) by fed1rmimpo02.cox.net with bizsmtp id Eqib1c00B4wtUdQ04qiekH; Sat, 11 Jul 2009 22:42:38 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.0 c=1 a=BlyxN78jMv0A:10 a=zEK_DtS_AAAA:8 a=N8B9JuSIAAAA:8 a=4vK6R0egOcoRXjFrOM8A:9 a=luZ1up1Lxm55XOVgoFcA:7 a=3mmEe47hzEidsevBP3bVRgIxIQ4A:4 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=LaXFLrg3fK6mJ3DwtRcA:9 a=7BSBMtQoYygLWnKK0TIA:7 a=wWVC3Xk9friNItBy3uQZl-d_mL0A:4 a=MSl-tDqOz04A:10 a=EzXvWhQp4_cA:10 X-CM-Score: 0.00 Message-ID: <9E512690C59B452486094CDA199F2475@wills> From: "Mike Wills" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Flowmaster Hushpower Report Date: Sat, 11 Jul 2009 19:42:37 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0193_01CA025F.BE585890" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0193_01CA025F.BE585890 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: David Leonard=20 To: Rotary motors in aircraft=20 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=3D35054 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 :-) --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net ------=_NextPart_000_0193_01CA025F.BE585890 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dave,
 
My "muffler" is a copy of this design. = Except its=20 made of Inconel. Unfortunately it doesnt really serve its intended = purpose of=20 muffling as you know. Could be my implementation as the center tube = diameter=20 could be too large. I expect it will still be holding up just fine when = I=20 replace it because it doesnt muffle. I'm thinking of trying the DNA = muffler next=20 pending Mark's final results.
 
One more data point. My buddy has a = Cobra kit car=20 with Ford 302 V8. His side pipes also use the spiral flow design. The = external=20 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=20 loud.
 
Mike Wills
 
RV-4 N144MW
----- Original Message -----
From:=20 David=20 Leonard
Sent: Thursday, July 09, 2009 = 7:38=20 PM
Subject: [FlyRotary] Flowmaster = Hushpower=20 Report

For the last couple hundred hours I have been using a Flowmaster=20 Hushpower II muffler.  Also used by Tracy and some others I = think. =20 It is done.  The outside held up wery well, but I reciently = removed it=20 and discovered that the insides have entirely disientigrated.  = Whatever=20 they used as packing has turned to a heavy clay-like substance = ratteling=20 around in the bottom.  She steel mesh is in pieces.  I = had been=20 thinking that the plane was not as quiet as it seemed 2 years = ago..  go=20 figure.
 
So I was thinking about one of the DNA Mufflers someone = mentioned. =20 They seemed nice because there is no packing, just steel = dividers. =20 Unfortunately, it is a little to big around to fit in my current set=20 up.   Instead, I ordered this muffler that also has = steel=20 innards but no packing:
http://www.moroso.com/catalog/categorydisplay.asp?catcode=3D35054
 
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=20 I ordered.
 
Will report back in 2 years on its performance  :-)

--
David Leonard

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