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 3735351 for flyrotary@lancaironline.net; Sun, 28 Jun 2009 11:16:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.211; envelope-from=msteitle@gmail.com Received: by bwz7 with SMTP id 7so1126059bwz.19 for ; Sun, 28 Jun 2009 08:15:46 -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=ckHzJoRaYwrz9H92sKx4OFv1j2M+KmAidNbDgKrd2Qc=; b=uJ2uI+PbuhA2l9f/e3+EBFIxnyqQo38bWwZ3fTSH7sytvOAo/eRctahfskM0S6r+/O 9suNx9yp0/SCCSt3Q2yUNFMebJCMwn0jRRXDrMpjkY99ROCYBR+JJebeZMKuycePgfYh xPjAiDdWTzBKHkQf2Boau9jwD567ZeOI9qFMA= 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=lHy5zU7RpBtECwHATEQzwz4k9xhHWCQr701ep8lP3xjRcvIYE8ILc7pNN+ywCl8kg+ 2Oqov4UYh5MdEY+ygGEMwLMXLV7cXLX9h2xdpAtoABT+nQEP3ZRp4qa26+YDEvNtSmgR VSZ8NjjI1Xa+9tqgEAJz/OicHZpQJ0p4uJfgI= MIME-Version: 1.0 Received: by 10.204.66.17 with SMTP id l17mr6075393bki.44.1246202146668; Sun, 28 Jun 2009 08:15:46 -0700 (PDT) In-Reply-To: References: Date: Sun, 28 Jun 2009 10:15:46 -0500 Message-ID: <5cf132c0906280815yd866e15p4cbd1036a994971b@mail.gmail.com> Subject: Re: [FlyRotary] Re: DNA Muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=001636c5bbd145408e046d6a0c5d --001636c5bbd145408e046d6a0c5d Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Mike, I checked it before my trip to Denver and it looks like it is holding up great. I will make another report after I get home. That willl add another 10 hours on it. Stay tuned... Mark On Sun, Jun 28, 2009 at 10:00 AM, Mike Wills wrote: > Mark, > > How about an update? > > Mike Wills > RV-4 N144MW > > ----- Original Message ----- > *From:* Mark Steitle > *To:* Rotary motors in aircraft > *Sent:* Monday, March 09, 2009 5:08 AM > *Subject:* [FlyRotary] Re: DNA Muffler > > 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. >> >> > --001636c5bbd145408e046d6a0c5d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Mike,
I checked it before my trip to Denver and it looks like it is holding = up great.=A0 I will make another report after I get home.=A0 That willl add= another 10 hours on it.=A0 Stay tuned...
=A0
Mark

On Sun, Jun 28, 2009 at 10:00 AM, Mike Wills <rv-4mike@cox.net= > wrote:
Mark,
=A0
=A0How about an update?
=A0
Mike Wills
RV-4 N144MW
----- Original Message -----
Sent: Monday, March 09, 2009 5:08 AM=
Subject: [FlyRotary] Re: DNA Muffler=

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 -----
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.


--001636c5bbd145408e046d6a0c5d--