X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3735365 for flyrotary@lancaironline.net; Sun, 28 Jun 2009 11:01:00 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao104.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20090628150023.VXME17135.fed1rmmtao104.cox.net@fed1rmimpo03.cox.net> for ; Sun, 28 Jun 2009 11:00:23 -0400 Received: from wills ([68.105.87.229]) by fed1rmimpo03.cox.net with bizsmtp id 9T0M1c0034wtUdQ04T0N6w; Sun, 28 Jun 2009 11:00:22 -0400 X-VR-Score: -100.00 X-Authority-Analysis: v=1.0 c=1 a=kviXuzpPAAAA:8 a=BQK-xGKPAAAA:8 a=-ZuN7NHRhRqbxDgGChsA:9 a=6DB8HZjE5TcdeDg7JL0A:7 a=i9wNG4LYXe0p1zYM0snNHGGFrMUA:4 a=XItmN0KQFAoA:10 a=4vB-4DCPJfMA:10 a=8mQLQ2bqF50T0Dbk:21 a=r_BqdqPn5G6RUnaq:21 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=ypuqiB5zK8lFhFI4XPAA:9 a=XKa7WmqlwcEZ4b78bWIA:7 a=xMhpVDERmTaKe91jClXsqucae9AA:4 a=MSl-tDqOz04A:10 a=EzXvWhQp4_cA:10 X-CM-Score: 0.00 Message-ID: From: "Mike Wills" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: DNA Muffler Date: Sun, 28 Jun 2009 08:00:21 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01C9F7C6.7C655210" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0025_01C9F7C6.7C655210 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mark, How about an update? Mike Wills RV-4 N144MW ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Monday, March 09, 2009 5:08 AM Subject: [FlyRotary] Re: DNA Muffler Mike,=20 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 -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 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. =20 Mark S. ------=_NextPart_000_0025_01C9F7C6.7C655210 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Mark,
 
 How about an update?
 
Mike Wills
RV-4 N144MW
----- Original Message -----
From:=20 Mark = Steitle=20
Sent: Monday, March 09, 2009 = 5:08=20 AM
Subject: [FlyRotary] Re: DNA=20 Muffler

Mike,
 
It may be a little premature to declare it a winner, but with ~10 = hrs on=20 it now, it is holding up better than anything I've tried so far.  = Keep in=20 mind that this is DNA's best muffler, rated for 1000hp.  It = is made=20 of fairly thick SS, .030 if I recall, much thicker material = than most=20 mufflers.  I had to add a 3" to 2" taper to the outlet = in order=20 for it to be acceptable in the noise category, but=20 that was surprisingly effective in reducing the exhaust = noise=20 to an acceptable level.  (Maybe I should have just put the = reducer=20 on the 3" downpipe and saved some weight.)  Anyway, when it = passes 25=20 hours, I'll post another update.  At this time it is looking = very=20 promising.
 
Mark S.

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

Does anyone on the list have any real-life rotary=20 experience with the DNA Gen II muffler (http://www.dnamufflers.com/DNA/main_DNA.html)?  = It is an=20 interesting design in that it has no packing material to burn = out. =20 Instead, it utilizes ladder-rungs, which they call "internal sound = diffusers", which resemble a chain of DNA down through the = center of=20 the muffler body, which is made of 304 SS.  Their web site = claims=20 that the racers use them with great success.  From speaking = with a=20 sales rep, they claim there the rotary crowd uses them too.  = I'm=20 considering purchasing one of their FULL THROTTLE COLLECTOR = mufflers (P/N=20 1040), but thought I would check to see if anyone else has = used this=20 style muffler.  This muffler has a 3" inlet/outlet with a 4"=20 body.  So it is compact enough to fit inside my = cowl.  My=20 exhaust header has a 3" swivel joint, so it should be a good = fit. =20
 
Mark=20 S.

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