X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([204.127.217.102] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3754269 for flyrotary@lancaironline.net; Sun, 12 Jul 2009 01:05:26 -0400 Received-SPF: pass receiver=logan.com; client-ip=204.127.217.102; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-157-63-203.mco.bellsouth.net[68.157.63.203]) by isp.att.net (frfwmhc02) with SMTP id <20090712050448H02007kpsae>; Sun, 12 Jul 2009 05:04:48 +0000 X-Originating-IP: [68.157.63.203] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Flowmaster Hushpower Report Date: Sun, 12 Jul 2009 01:04:49 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01CA028C.C1DCA3E0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcoCo4D1QeVQhK5ORFqXtJWebrLmiwACneOw X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_000C_01CA028C.C1DCA3E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 ------=_NextPart_000_000C_01CA028C.C1DCA3E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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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