X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f211.google.com ([209.85.218.211] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3754222 for flyrotary@lancaironline.net; Sat, 11 Jul 2009 23:47:36 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.211; envelope-from=msteitle@gmail.com Received: by bwz7 with SMTP id 7so1207629bwz.19 for ; Sat, 11 Jul 2009 20:47:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=j/WLPcoZql/uzmCsVK/C3d64N5s0hjnzhYwzxcLBVZo=; b=b69Hqomldqt7JDfLIxKGy/mFv31R+iXfAdEPG6XjiQK9b4LwBamMFmm/7oezpyNkH8 nJAGEE9hKlZgEXx09VVISqJsUINh8UwRlUl3kjZt7NHbU2LLJgHYUB//29LIec+fJktS yVo7mG0ec5oek4eZdDqc9HEzWhsNpl1LmOQaE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=szVs9rITvUV37xFlKr1pCa3YhNhYLrKW3dpfFkv267cg+RrMccN+fKVYtYwh6JBiU1 n3M1wDyQKCzFw2pCcYJjTl2Ahkvao7UCnVr7EOLJK4LFA5n4p8PF9IHoQlWPW7XPn2bK J67+I5PsXCXN7P43nfOA+s73uRV0blxvexHGk= MIME-Version: 1.0 Received: by 10.204.51.210 with SMTP id e18mr3666862bkg.69.1247370419389; Sat, 11 Jul 2009 20:46:59 -0700 (PDT) In-Reply-To: References: Date: Sat, 11 Jul 2009 22:46:59 -0500 Message-ID: <5cf132c0907112046o4a0a5054jcff0519c8b9c8ded@mail.gmail.com> Subject: Re: [FlyRotary] Re: Flowmaster Hushpower Report From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=001636c5a69cc04706046e7a0ed4 --001636c5a69cc04706046e7a0ed4 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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 > > --001636c5a69cc04706046e7a0ed4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Mike,
For my first muffler attempt, I=A0copied the spiral flow design for my= 20B.=A0 While it worked (passed gas), I wouldn't call it quiet, and ne= ither=A0did my=A0airport neighbors.=A0
=A0
Mark S.


=A0
On Sat, Jul 11, 2009 at 9:42 PM, Mike Wills <rv-4mike@cox.net&= gt; wrote:
Dave,
=A0
My "muffler" is a copy of th= is design. Except its made of Inconel. Unfortunately it doesnt really serve= its intended purpose of muffling as you know. Could be my implementation a= s the center tube diameter could be too large. I expect it will still be ho= lding up just fine when I replace it because it doesnt muffle. I'm thin= king of trying the DNA muffler next pending Mark's final results.
=A0
One more data point. My buddy has a Co= bra kit car with Ford 302 V8. His side pipes also use the spiral flow desig= n. 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.
=A0
Mike Wills
=A0
RV-4 N144MW
----- Original Message -----
Sent: Thursday, July 09, 2009 7:38 P= M
Subject: [FlyRotary] Flowmaster Hush= power Report

For the last couple hundred hours I have been using a Flowmaster Hushp= ower II muffler.=A0 Also used by Tracy and some others I think.=A0 It is do= ne.=A0 The outside held up wery well, but I reciently removed it and discov= ered that the insides have entirely disientigrated.=A0 Whatever they used a= s packing=A0has turned to a heavy clay-like substance ratteling around in t= he bottom.=A0=A0She steel mesh is in pieces.=A0 I had been thinking that th= e plane was not as quiet as it seemed 2 years ago..=A0 go figure.
=A0
So I was thinking about one of the DNA Mufflers someone mentioned.=A0 = They seemed nice because there is no packing,=A0just steel dividers.=A0 Unf= ortunately, it is a little to big around to fit in my current set up.=A0=A0= =A0Instead, I ordered this muffler that also has steel innards but no packi= ng:
=A0
It is nice because it is going to be smaller and lighter than the flow= master (or the DNA), as well as less expensive - even the SS version that I= ordered.
=A0
Will report back in 2 years=A0on its performance=A0 :-)

--
David Leonard

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

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