X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f134.google.com ([209.85.221.134] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3533915 for flyrotary@lancaironline.net; Mon, 09 Mar 2009 08:08:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.221.134; envelope-from=msteitle@gmail.com Received: by qyk40 with SMTP id 40so979871qyk.7 for ; Mon, 09 Mar 2009 05:08:12 -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=SzfZIFgybb26gjm3G286f6GAwwU3nhR4CeDGajbQ7vA=; b=btSl0oS69yfz17uDDkazhg1AcZjFkGYMsztqInxOIB/KmjiU1Ik9oAWjdAYkFTLVIC JfTtpby6UnGfArg+frwJfIe6DTo2NSRGN/Ufj14hZUBWiLghQaxgYNf64MpoGjc6CMIR 4E7J96blO5CCC0o0lieJhn+fW/qymUi/Rasxg= 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=SGIL5W1rRbTkzVsq8xt+5vitzyCTvaj9DYvIvsM1+NOp+XIs5OE5gfa+EMouSIrWYL zYBsSllpRHHn7F4oJ9lYlwDWkypHYyYQRHwbSX1gsBB1tk7gEryMTY731h77Q4Yi5OgJ zpffmnO9XYmIgsIc5QfhoLLm85h3JCjs+IUxY= MIME-Version: 1.0 Received: by 10.224.2.67 with SMTP id 3mr6961729qai.257.1236600492127; Mon, 09 Mar 2009 05:08:12 -0700 (PDT) In-Reply-To: References: Date: Mon, 9 Mar 2009 07:08:12 -0500 Message-ID: <5cf132c0903090508o300289c7kfde9897c5cd56c93@mail.gmail.com> Subject: Re: [FlyRotary] Re: DNA Muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cdaaa0ff8170464ae7d10 --0015175cdaaa0ff8170464ae7d10 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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. > > --0015175cdaaa0ff8170464ae7d10 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
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-4mike@cox.net&g= t; wrote:
Mark,
=A0
=A0Any update on the DNA muffler?
=A0
Mike Wills
RV-4 N144MW
----- Original Message -----
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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