X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rv-out-0506.google.com ([209.85.198.227] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3429463 for flyrotary@lancaironline.net; Fri, 16 Jan 2009 11:20:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.198.227; envelope-from=msteitle@gmail.com Received: by rv-out-0506.google.com with SMTP id f6so1952696rvb.7 for ; Fri, 16 Jan 2009 08:19:40 -0800 (PST) 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=P57Wul1o1eXTZBAVYDEEcYSAw4MeheC6uc74RiEJArY=; b=qIFBmIwHlC+2K8ZZVjtRCK3Uz4JFaVbMnjVz4U8s53ricjcEo7gfPOWfdILV8UwsTq aImEzdMEdecSXVlzkWGKfTNa42GWSQFd99P3pUheHxBHoIvmWOhL6El8y0kIT9YlvHI3 c0N3+Ads1fMPqKwj8q2MIIM+gVb4XjAdudFkc= 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=ZAH8bcYoORFodQGUooy7oBzYm2L8No6mcRW/+aKNsrqD444p4Pvmq7Vhffes07Mf0Z 10W1KxFIs1cAJZrisqCKApr7f0Dbjst5Hx7vVRzeFFtBCo/N5ozwudc5Riz7MH9VylRv J9vCqPHy1nAJTJ9FJtUoQw8bFixrxqb0VOGz0= MIME-Version: 1.0 Received: by 10.141.153.16 with SMTP id f16mr1280938rvo.283.1232122779822; Fri, 16 Jan 2009 08:19:39 -0800 (PST) In-Reply-To: References: Date: Fri, 16 Jan 2009 10:19:39 -0600 Message-ID: <5cf132c0901160819t1285ea74pdb83eb8c18c9fc97@mail.gmail.com> Subject: Re: [FlyRotary] Re: DNA Muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000e0cd1481a9c6b8704609bf05b --000e0cd1481a9c6b8704609bf05b Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Ed, That is exactly what I was concerned about too. But if you look closely, you can see that the bars are made of 90* angle. That should make them much stronger than straight bar stock. Not sure what material the cross bars are made from though. The p/n 1040 is made to weld to a header/collector and they claim it is good for up to 1000hp. I have gone ahead and ordered one. I figure it couldn't be any louder than the Hushpower II whose guts are laying on the hangar floor in a pile of powder and small pieces. Based on its short lifespan and the rust-colored debris, I doubt the Hushpower muffler's innards are made of SS. ;-( Mark On Fri, Jan 16, 2009 at 10:08 AM, Ed Anderson wrote: > Appears somewhat similar in concept to the SpinTech muffler using > baffles/ladders to break up the sound wave front. The thing I would wonder > about is whether those ladders which appears to stretch across the diameter > of the tube could withstand the pulse pounding from the rotor. My > experience with the turbo 13B (with no exhaust splitters) would indicate it > might not long withstand that pounding. But, I could be wrong about that. > > > > Guess you're going to have to buy one and let the rest of us know, Mark. > > > > Ed > > > > Ed Anderson > > Rv-6A N494BW Rotary Powered > > Matthews, NC > > eanderson@carolina.rr.com > > http://www.andersonee.com > > http://members.cox.net/rogersda/rotary/configs.htm#N494BW > > http://www.dmack.net/mazda/index.html > ------------------------------ > > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *On > Behalf Of *Mark Steitle > *Sent:* Friday, January 16, 2009 9:05 AM > *To:* Rotary motors in aircraft > *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. > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 3267 (20080714) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > --000e0cd1481a9c6b8704609bf05b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Ed,
 
That is exactly what I was concerned about too.  But if you look = closely, you can see that the bars are made of 90* angl= e.  That should make them much stronger than straight bar stock.&= nbsp; Not sure what material the cross bars are made from though. = ; The p/n 1040 is made to weld to a header/collector and they cla= im it is good for up to 1000hp.    
 
I have gone ahead and ordered one.  I figure it couldn't be a= ny louder than the Hushpower II whose guts are laying on the hang= ar floor in a pile of powder and small pieces.  Based on its shor= t lifespan and the rust-colored debris, I doubt the Hushpower muffler's= innards are made of SS.  ;-(
 
Mark

On Fri, Jan 16, 2009 at 10:08 AM, Ed Anderson <eanderson@= carolina.rr.com> wrote:

Appears somewhat similar in concept= to the SpinTech muffler using baffles/ladders to break up the sound wave f= ront.  The thing I would wonder about is whether those ladders which a= ppears to stretch across the diameter of the tube could withstand the pulse= pounding from the rotor.  My experience with the turbo 13B (with no e= xhaust splitters) would indicate it might not long withstand that pounding.=   But, I could be wrong about that.

 

Guess you're going to have to buy o= ne and let the rest of us know, Mark.

 

Ed

 

From: Rota= ry motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Friday, January 16, 2= 009 9:05 AM
To: Rotary m= otors in aircraft
Subject: [FlyRotary] DNA Muffler

http://www.dnamufflers.com/DNA/main_DNA.htm= l)? = It is an interesting design in that it has no packing material to burn out= .  Instead, it utilizes ladder-rungs, which they call "internal s= ound diffusers", which resemble a chain of DNA down through the c= enter of the muffler body, which is made of 304 SS.  Their web site cl= aims 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 s= tyle muffler.  This muffler has a 3" inlet/outlet with a 4" = body.  So it is compact enough to fit inside my cowl.  My ex= haust header has a 3" swivel joint, so it should be a good fit.  =

http://www.eset.com


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