X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rv-out-0506.google.com ([209.85.198.237] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3430480 for flyrotary@lancaironline.net; Fri, 16 Jan 2009 20:40:26 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.198.237; envelope-from=msteitle@gmail.com Received: by rv-out-0506.google.com with SMTP id f6so2175087rvb.7 for ; Fri, 16 Jan 2009 17:39:50 -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=tbZN57vAjg2R4jnPqh6S4ddzIKzyO5B9ec91b8uS8Pc=; b=ES7pFDk8ikohAMIOBE/MNx3j4312pQWRCXzmbCEFNa0e1Aufmas8secTLeVlzS0pDx AL9n+78Td2UpnpQQPV53DrcdjntfCC4B+tLFJ5rmmqN/PJHi8E06qM8Kw/cRPnAlXDrE bknThmazcQMtKGytn7skMIOm6xPz3x9MiEFWw= 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=Iwh9nEP5w/WrK7HsWN1R3ohxdhVAkbAAiKzJydkbqDpxI9pT29Kt0BVWuhoFWGjUVK xHFCAt8pmZ1IafLmoa2hF5uRGGIlXGjyrBxENhXLFV4k3B+8Zn1H4Gsd5mw5StYH866d 89rEiEuIZ3ePnR7VgvDCdMJf2G6GXvdpl98xw= MIME-Version: 1.0 Received: by 10.140.172.20 with SMTP id u20mr893651rve.244.1232156389703; Fri, 16 Jan 2009 17:39:49 -0800 (PST) In-Reply-To: References: Date: Fri, 16 Jan 2009 19:39:49 -0600 Message-ID: <5cf132c0901161739k48ee761dxbb4c80e3e2c00934@mail.gmail.com> Subject: Re: [FlyRotary] Re: DNA Muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000e0cd296acea806b0460a3c3d5 --000e0cd296acea806b0460a3c3d5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit George, It runs about $135 US, plus shipping from Canada. So, yes, looks like a good price... if it works. Mark On Fri, Jan 16, 2009 at 7:11 PM, George Lendich wrote: > Mark, > I had a quick look and noticed the parts welded from the outside - very > good I thought. The edges facing down stream will help. I didn't notice the > price, so what price is the Gen 2. > My parts cost me about $250 (Aust) and the welding, perhaps $150 (Aust)- so > if your buying it for about $250 US it's a good price. > George ( down under) > > ----- Original Message ----- > *From:* Mark Steitle > *To:* Rotary motors in aircraft > *Sent:* Saturday, January 17, 2009 10:51 AM > *Subject:* [FlyRotary] Re: DNA Muffler > > George, > > With the edges of each cross bar pointed downstream of the exhaust flow, I > don't see a problem with the heat attacking them. Also, if one were to > somehow break loose, I don't see how it could manage to block the exit, > maybe partially, but not totally. The engine should still run at reduced > power if that were to happen. I would like to special order one made of > 321ss. Also, if you look at the DNA web site, you'll see that they make a > Gen 1 and a Gen II. The Gen II is much stronger as the cross bars protrude > through the can and are welded from the outside. The Gen I bars are spot > welded to the can. The Gen II is also more than twice the price of the Gen > I. > > Mark S. > > On Fri, Jan 16, 2009 at 4:10 PM, George Lendich wrote: > >> Mark, >> The heat and pulses attack/ affect the weakest part of any internal part, >> a thin edge is the weakest part. You will notice that I don't expose and >> edges to the sound wave or hot gases. >> George ( down under) >> >> 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 >>> >> >> > --000e0cd296acea806b0460a3c3d5 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable George,

It runs about $135 US, plus shipping from Canada.  So,= yes, looks like a good price... if it works.

Mark

On Fri, Jan 16, 2009 at 7:11 PM, George Lendich <lendich@optusnet.co= m.au> wrote:
Mark,
I had a quick look and noticed the par= ts welded=20 from the outside - very good I thought. The edges facing down stream will h= elp.=20 I didn't notice the price, so what price is the Gen 2.
My parts cost me about $250 (Aust) and= the welding,=20 perhaps $150 (Aust)- so if your buying it for about $250 US it's a good= =20 price.
George ( down under)
----- Original Message -----
From:=20 Mark Steitle=20
Sent: Saturday, January 17, 2009 1= 0:51=20 AM
Subject: [FlyRotary] Re: DNA=20 Muffler

George,

With the edges of each cross bar pointed= =20 downstream of the exhaust flow, I don't see a problem with the heat a= ttacking=20 them.  Also, if one were to somehow break loose, I don't see how= it could=20 manage to block the exit, maybe partially, but not totally.  The eng= ine=20 should still run at reduced power if that were to happen.  I would l= ike=20 to special order one made of 321ss.  Also, if you look at the DNA we= b=20 site, you'll see that they make a Gen 1 and a Gen II.  The Gen I= I is much=20 stronger as the cross bars protrude through the can and are welded from t= he=20 outside.  The Gen I bars are spot welded to the can.  The Gen I= I is=20 also more than twice the price of the Gen I.  

Mark S.
On Fri, Jan 16, 2009 at 4:10 PM, George Lendic= h <lendich@optusnet.com.au>=20 wrote:
Mark,
The heat and pulses attack/ affect= the weakest=20 part of any internal part, a thin edge is the weakest part. You wi= ll=20 notice that I don't expose and edges to the sound wave or hot= =20 gases.
George ( down under)
Ed,
 
That is exactly what I was concerned about too.  But if you= look=20 closely, you can see that the bars are made=20 of 90* angle.  That should make them much stronge= r=20 than straight bar stock.  Not sure what material the cross=20 bars are made from though.  The p/n 1040 is made to we= ld to=20 a header/collector and they claim it is good for up to 1000hp.&n= bsp;=20   
 
I have gone ahead and ordered one.  I figure it couldn'= t be=20 any louder than the Hushpower II whose guts are laying on t= he=20 hangar floor in a pile of powder and small pieces.  Based on&nbs= p;its=20 short lifespan and the rust-colored debris, I doubt the Hushpower=20 muffler's innards are made of SS.  ;-(
 
Mark

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

Appears=20 somewhat similar in concept to the SpinTech muffler using=20 baffles/ladders to break up the sound wave front.  The thing I= =20 would wonder about is whether those ladders which appears to stretc= h=20 across the diameter of the tube could withstand the pulse pounding = from=20 the rotor.  My experience with the turbo 13B (with no exhaust= =20 splitters) would indicate it might not long withstand that=20 pounding.  But, I could be wrong about that.

 

Guess you're=20 going to have to buy one and let the rest of us know,=20 Mark.

 

Ed

 

From:=20 Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark=20 Steitle
Sent: F= riday,=20 January 16, 2009 9:05 AM


To:=20 Rotary motors in aircraft
Subject: [FlyRotary] DNA=20 Muffler

 

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

 

Mark=20 S.



__________=20 Information from ESET NOD32 Antivirus, version of virus signature= =20 database 3267 (20080714) __________

The message was checked = by=20 ESET NOD32 Antivirus.

http://www.eset.com



--000e0cd296acea806b0460a3c3d5--