X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qw-out-2122.google.com ([74.125.92.26] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3540221 for flyrotary@lancaironline.net; Mon, 09 Mar 2009 11:39:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.92.26; envelope-from=rwstracy@gmail.com Received: by qw-out-2122.google.com with SMTP id 8so867547qwh.25 for ; Mon, 09 Mar 2009 08:38:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to :content-type; bh=M39bFzxiw13TipL46Eewo0cF5o4B7AeD2FmR9etXJQA=; b=uQyWJzdPe12k5jrZQQoo/gZW5xD5owiZRSnHmr91ZJp7/8IkrsgZLUO8iwq3Z8ISfQ 9Uwh/ppDSe8ORbsoyB5cKqW5kgrLWmoHKC161fbThkcATbgmh8wYaBs7Zd8yIFZotAn1 afcXDMiMyzXUxy2CLkzjBWLs2yDYO9illh0Dw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=AEy5kicaHiRYMclk95mir92SuHzrC2m1gTjjo6+PhW3IkZfZ+7WmLqc+0vUyOV/HGm rpxvMkW3AJUKGL65FC/ItKIJJuyBc+nuJFvK09ByVK7bbWws72cUD90OMxVS8Gc6X5Y2 3QTr7eX9GQYTwmMiNdIGQMhFopiUfn5DgWF1M= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.224.80.148 with SMTP id t20mr7308140qak.349.1236613119832; Mon, 09 Mar 2009 08:38:39 -0700 (PDT) In-Reply-To: References: Date: Mon, 9 Mar 2009 11:38:39 -0400 X-Google-Sender-Auth: b404f1cbeca78f01 Message-ID: <1b4b137c0903090838w33bd7095w54101c00f2f4f4f4@mail.gmail.com> Subject: Re: [FlyRotary] Re: DNA Muffler From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175ce1b6bb76550464b16d67 --0015175ce1b6bb76550464b16d67 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit "sounds good" Mark. My guess is that the 2" restrictor is in the correct place now. Don't think it would be as effective before the muffler. But the big question is, did the 3 to 2 " reducer cause any noticeable power loss? I plan to do the same thing on my plane when time allows. Tracy On Mon, Mar 9, 2009 at 8:08 AM, Mark Steitle wrote: > Mike, > > It may be a little premature to declare it a winner, but with ~10 hrs on it > now, it is holding up better than anything I've tried so far. Keep in mind > that this is DNA's best muffler, rated for 1000hp. It is made of fairly > thick SS, .030 if I recall, much thicker material than most mufflers. I had > to add a 3" to 2" taper to the outlet in order for it to be acceptable in > the noise category, but that was surprisingly effective in reducing the > exhaust noise to an acceptable level. (Maybe I should have just put the > reducer on the 3" downpipe and saved some weight.) Anyway, when it passes > 25 hours, I'll post another update. At this time it is looking very > promising. > > Mark S. > > On Sun, Mar 8, 2009 at 9:20 PM, Mike Wills wrote: > >> Mark, >> >> Any update on the DNA muffler? >> >> Mike Wills >> RV-4 N144MW >> >> ----- Original Message ----- >> *From:* Mark Steitle >> *To:* Rotary motors in aircraft >> *Sent:* Friday, January 16, 2009 7:05 AM >> *Subject:* [FlyRotary] DNA Muffler >> >> Does anyone on the list have any real-life rotary experience with the DNA >> Gen II muffler (http://www.dnamufflers.com/DNA/main_DNA.html)? >> It is an interesting design in that it has no packing material to burn out. >> Instead, it utilizes ladder-rungs, which they call "internal sound >> diffusers", which resemble a chain of DNA down through the center of the >> muffler body, which is made of 304 SS. Their web site claims that the >> racers use them with great success. From speaking with a sales rep, they >> claim there the rotary crowd uses them too. I'm considering purchasing one >> of their FULL THROTTLE COLLECTOR mufflers (P/N 1040), but thought I would >> check to see if anyone else has used this style muffler. This muffler has a >> 3" inlet/outlet with a 4" body. So it is compact enough to fit inside my >> cowl. My exhaust header has a 3" swivel joint, so it should be a good fit. >> >> >> Mark S. >> >> > --0015175ce1b6bb76550464b16d67 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable "sounds good" Mark.=A0 My guess is that the 2" restrictor is= in the correct place now.=A0 Don't think it would be as effective befo= re the muffler.

But the big question is, did the 3 to 2 " reduc= er cause any noticeable power loss?=A0=A0 I plan to do the same thing on my= plane when time allows.

Tracy

On Mon, Mar 9, 2009 at 8:08 AM,= Mark Steitle <m= steitle@gmail.com> wrote:
Mike,
=A0
It may be a little premature to declare it a winner, but with ~10 hrs = on it now, it is holding up better than anything I've tried so far.=A0 = Keep in mind that this is DNA's=A0best muffler, rated for 1000hp.=A0 It= is made of fairly thick SS, .030 if I recall, much thicker material than= =A0most mufflers.=A0 I had to add a 3" to 2"=A0taper=A0to the out= let in order for it to be acceptable in the noise category, but that=A0was= =A0surprisingly effective=A0in reducing the exhaust noise to an acceptable = level.=A0 (Maybe I should have just=A0put the reducer on the 3" downpi= pe and saved some weight.)=A0 Anyway, when it passes 25 hours, I'll pos= t=A0another update.=A0 At this time it is looking very promising.
=A0
Mark S.

On Sun, Mar 8, 2009 at 9:20 PM, Mike Wills <rv-4= mike@cox.net> wrote:
Mark,
=A0
=A0Any update on the DNA muffler?
=A0
Mike Wills
RV-4 N144MW
----- Original Message -----
From: Mark Steitle
Sent: Friday, January 16, 2009 7:05 = AM
Subject: [FlyRotary] DNA Muffler

Does anyone on the list=A0have any=A0real-life rotary experience with= =A0the DNA Gen II muffler (http://www.dnamufflers.com/DNA/main_DNA.html= )?=A0 It is a= n interesting design in that it has no packing material to burn out.=A0 Ins= tead, it utilizes ladder-rungs, which they call "internal sound diffus= ers",=A0which resemble a chain of DNA down through the center of the m= uffler body, which is made of 304 SS.=A0 Their web site claims that the rac= ers use them with great success.=A0 From speaking with a sales rep, they cl= aim there the rotary crowd uses them too.=A0 I'm considering purchasing= one of their FULL THROTTLE COLLECTOR mufflers (P/N 1040), but thought I wo= uld check=A0to see if anyone else has used this style muffler.=A0 This muff= ler has a 3" inlet/outlet with a 4" body.=A0 So it is compact eno= ugh to fit inside=A0my cowl.=A0 My exhaust header has a 3" swivel join= t, so it should be a good fit.=A0
=A0
Mark S.


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