X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3430433 for flyrotary@lancaironline.net; Fri, 16 Jan 2009 19:34:41 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta06.mail.rr.com with ESMTP id <20090117003404.IHCQ93.cdptpa-omta06.mail.rr.com@computername> for ; Sat, 17 Jan 2009 00:34:04 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: DNA Muffler Date: Fri, 16 Jan 2009 19:34:07 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C97811.662F68D0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: Acl39lK0xy8wJrStRii6X5V3uqd5iQARH3sA X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-Reply-To: Message-Id: <20090117003404.IHCQ93.cdptpa-omta06.mail.rr.com@computername> This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C97811.662F68D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Actually, Mark, the hushpower II can be had in 304 or 409 Stainless Steel alloy. 409 are apparently a special grade of stainless designed for exhaust system - apparently the surface will oxidize but then stabilize - undoubtedly cheaper alloy to use and probably last longer than mild steel. Mine is made of the 409 and it too shows signs of rust, but no signs of serious deterioration. I missed the angle shape, so I agree, should last considerably longer. Naturally we are all interested in what you find out. 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 11:20 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: DNA Muffler 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 ------=_NextPart_000_0004_01C97811.662F68D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Actually, Mark, the hushpower II = can be had in 304 or 409 Stainless Steel alloy.  409 are apparently a = special grade of stainless designed for exhaust system – apparently the surface = will oxidize but then stabilize – undoubtedly cheaper alloy to use and probably last longer than mild steel.  Mine is made of the 409 and = it too shows signs of rust, but no signs of serious = deterioration.

 

I missed the angle shape, so I = agree, should last considerably longer.  Naturally we are all interested = in what you find out.

 

 

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<= font size=3D2 face=3DArial>

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Friday, January 16, = 2009 11:20 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = DNA Muffler

 

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 <eanderson@carolina.rr.com&g= t; 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

 

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

 

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