X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f134.google.com ([209.85.221.134] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3543485 for flyrotary@lancaironline.net; Wed, 11 Mar 2009 08:29:25 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.221.134; envelope-from=msteitle@gmail.com Received: by qyk40 with SMTP id 40so2165594qyk.7 for ; Wed, 11 Mar 2009 05:28:48 -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=mmwhTZWQ44HOiCHbtR7+AMMYIhd2rKPOTa6h3odSpx8=; b=QFublZs7qtEo9YHRNF8ADHuvurorwpgTxdOro78jGLKGGdSGWLvP/qpATbS1Zjlhjp X4/kOiGV0NribqowcXVUFrb1C6TPDdKBhJ00nXPMmr/mR3DtkKBtIIpkA0n+qaCthOoX bKrsSjAsqu90BdW6EJDgjwSWk/6he5TtqhlAs= 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=qC5iQqlXbxOf+Cyf9MpK87BU2/jZgY6PdlmOqXFHT5CWzWX8eIf6z/jHY7gtDJCn77 PUVlwxP54qhoOmiKuBv/2JLzXF6rZBpr8SuNi4DJr2AgMD8FJUScY7/veKnLvd0yaVxz WFqIm/Cwun6CYO/mAsAKJM9JuXc/eD65Gpzbo= MIME-Version: 1.0 Received: by 10.224.2.82 with SMTP id 18mr10982071qai.262.1236774527333; Wed, 11 Mar 2009 05:28:47 -0700 (PDT) In-Reply-To: References: Date: Wed, 11 Mar 2009 07:28:47 -0500 Message-ID: <5cf132c0903110528n4aecda96ua8ac3700d9399ce8@mail.gmail.com> Subject: Re: [FlyRotary] Re: DNA Muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cb81e5e762d0464d7025a --0015175cb81e5e762d0464d7025a Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Jeff, Sorry, but I didn't weigh it. My guess is around 10-12 lbs. Mark On Wed, Mar 11, 2009 at 7:22 AM, Jeff Whaley wrote: > Hi Mark, I was just at the DNA website =85 they don=92t specify weight f= or > any of their products. > > The Hush Power II is about 20 lbs. > > What is the weight of your DNA-1040, Full Throttle Collector? > > Jeff > > > > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *O= n > Behalf Of *Mike Wills > *Sent:* Tuesday, March 10, 2009 10:36 PM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: DNA Muffler > > > > Agreed Mark. Was just looking for some feedback on that aspect since your > first email focused on the durability side. Thanks for the info and keep = us > posted. If it holds up I'll give it a try. > > > > Mike > > ----- Original Message ----- > > *From:* Mark Steitle > > *To:* Rotary motors in aircraft > > *Sent:* Tuesday, March 10, 2009 5:57 AM > > *Subject:* [Norton AntiSpam] [FlyRotary] Re: DNA Muffler > > > > That's true Mike, but the opposite is also true. If it muffles but doesn= 't > last, it still fails the test. That was the case with the HushPower II. = It > muffled great for about 30 minutes, then the guts oozed out into a puddle= on > the hangar floor. As for muffling, well, let's just say that you won't b= e > the stealthiest a/c of the group. But then my 20B Lancair isn't any loud= er > than an IO-540 powered Lancair, or so I'm told. > > > > When I first installed the DNA "Full Throttle Collector" (DNA p/n 1040) > muffler I was disappointed in its poor muffling qualities. It was about = as > loud as the gutted HP II, but at a lower tone and with a very high-pitche= d > aspect that my Lightspeed ANR headset couldn't cancel out. Then I > remembered what Tracy said about large diameter exhaust pipes (the DNA > muffler that I chose has a 3" inlet & 3" outlet). So, I purchased a 3" t= o > 2" tapered reducer from Burns Stainless and welded it onto the outlet. I= t > is surprising how much difference that one small change made in reducing > the noise level. The high-pitched aspect was now gone and the lower > frequencies were noticably reduced. If there was any loss of power I > couldn't tell it. So, out of the box the DNA is too loud, but with a sli= ght > modification, it is very acceptable. > > > > My main guage for acceptable exhaust noise is the comments I get from my > hangar neighbors. Early on I used to get lots of "friendly" comments abo= ut > how they could hear me coming long before they could see me. Now, those > comments have stopped. They still ask about that "strange sounding" engi= ne, > but only because it sounds different, not because it is loud enough to br= eak > windows for miles around. I'll try to remember to take some sound level > measurements next time I'm out at the airport. > > > > Mark S. > > On Mon, Mar 9, 2009 at 10:50 PM, Mike Wills wrote: > > Well, the other big question is does it actually muffle? If the best thin= g > that can be said about it is that it's surviving I'd be a little > disappointed. I know its hard to judge but how about your opinion regardi= ng > the volume? > > > > Thanks, > > > > Mike Wills > > ----- Original Message ----- > > *From:* Tracy Crook > > *To:* Rotary motors in aircraft > > *Sent:* Monday, March 09, 2009 8:38 AM > > *Subject:* [FlyRotary] Re: DNA Muffler > > > > "sounds good" Mark. My guess is that the 2" restrictor is in the correct > place now. Don't think it would be as effective before the muffler. > > But the big question is, did the 3 to 2 " reducer cause any noticeable > power loss? I plan to do the same thing on my plane when time allows. > > Tracy > > On Mon, Mar 9, 2009 at 8:08 AM, Mark Steitle wrote: > > 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 mi= nd > 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 passe= s > 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. Inste= ad, > it utilizes ladder-rungs, which they call "internal sound diffusers", whi= ch > resemble a chain of DNA down through the center of the muffler body, whic= h > 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 rota= ry > crowd uses them too. I'm considering purchasing one of their FULL THROTT= LE > 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 wit= h a > 4" body. So it is compact enough to fit inside my cowl. My exhaust head= er > has a 3" swivel joint, so it should be a good fit. > > > > Mark S. > > > > > > > > --0015175cb81e5e762d0464d7025a Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Jeff,
=A0
Sorry, but I didn't weigh it.=A0 My guess is around 10-12 lbs.
=A0
Mark

On Wed, Mar 11, 2009 at 7:22 AM, Jeff Whaley <jwhaley@datacast= .com> wrote:

Hi Mark, I was just at t= he DNA website =85 they don=92t specify weight for any of their products.

The Hush Power II is abo= ut 20 lbs.

What is the weight of yo= ur DNA-1040, Full Throttle Collector?

Jeff

=A0

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Mike Wills
Sent: Tuesday, March 10, 2009 10:36 PM
To: Rotary motors i= n aircraft
Subject: [FlyRotary] Re: DNA Muffler

<= /div>

=A0

Agreed Mark. Was just looking for some f= eedback on that aspect since your first email focused on the durability sid= e. Thanks for the info and keep us posted. If it holds up I'll give it = a try.

=A0

Mike

----- Original Message -----

=

From: Mark Steitle

Sent: Tuesday, March 10, 2009 5:57 AM

Subject: [Norton AntiSpam] [FlyRotary] Re: DNA Muffler

=A0

That's true Mike, but the opposite is also true.=A0 If it muffles bu= t doesn't last, it still fails the test.=A0 That was the case with the = HushPower II.=A0=A0It muffled great for about 30 minutes, then the guts=A0o= ozed out=A0into a puddle on the=A0hangar floor. =A0As for=A0muffling, well,= let's just say that you won't be the stealthiest a/c of the group.= =A0=A0But=A0then my 20B Lancair isn't any louder than an IO-540 powered= Lancair, or so I'm told.=A0=A0

=A0

When I first installed=A0the DNA "Full Throttle Collector" (DN= A p/n 1040) muffler=A0I was disappointed in=A0its poor muffling qualities.= =A0 It was about as loud as the gutted HP II, but at=A0a lower tone and wit= h a very high-pitched aspect that=A0my Lightspeed=A0ANR headset couldn'= t cancel out.=A0 Then I remembered what Tracy said about=A0large diameter e= xhaust=A0pipes (the DNA muffler that I chose has a=A03" inlet & 3&= quot; outlet).=A0 So, I purchased a=A03" to 2"=A0tapered reducer= =A0from Burns Stainless=A0and welded it onto the outlet.=A0=A0It is surpris= ing how much difference that one small change made in reducing the=A0noise = level.=A0 The high-pitched aspect was now gone and the lower frequencies we= re=A0noticably reduced.=A0=A0If there was=A0any loss of power I couldn'= t tell it.=A0 So, out of the box the DNA is too loud, but with a slight mod= ification, it is very acceptable.=A0

=A0

My=A0main guage for acceptable exhaust noise is=A0the comments I get fro= m my hangar neighbors.=A0 Early on I used to get lots of "friendly&quo= t; comments about how=A0they could hear me coming long before they could se= e me.=A0 Now, those comments have stopped.=A0 They still ask about that &qu= ot;strange sounding" engine, but only because it sounds different, not= because it is=A0loud enough to break windows for miles around.=A0 I'll= try to remember to take some sound level measurements next time I'm ou= t at the airport.=A0=A0

=A0

Mark S.=A0=A0=A0=A0

On Mon, Mar 9, 2009 at 10:50 PM, Mike Wills <rv-4mike@cox.net> wrote:

Well, the other big question is does it = actually muffle? If the=A0best thing that can be said about it is that it&#= 39;s surviving I'd be a little disappointed. I know its hard to judge b= ut how about your opinion regarding the volume?

=A0

Thanks,

=A0

Mike Wills

----- Original Message -----

=

Sent: Monday, March 09, 2009 8:38 AM

Subject: [FlyRotary] Re: DNA Muffler

=A0

"sounds good" Mark.=A0 My guess = is that the 2" restrictor is in the correct place now.=A0 Don't th= ink it would be as effective before the muffler.

But the big questio= n is, did the 3 to 2 " reducer cause any noticeable power loss?=A0=A0 = I plan to do the same thing on my plane when time allows.

Tracy

On Mon, Mar 9, 2009 at 8:08 AM, Mark Steitle <msteitle@gmail.com> wrote:

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 Ke= ep in mind that this is DNA's=A0best muffler, rated for 1000hp.=A0 It i= s made of fairly thick SS, .030 if I recall, much thicker material than=A0m= ost mufflers.=A0 I had to add a 3" to 2"=A0taper=A0to the outlet = in order for it to be acceptable in the noise category, but that=A0was=A0su= rprisingly effective=A0in reducing the exhaust noise to an acceptable level= .=A0 (Maybe I should have just=A0put the reducer on the 3" downpipe an= d saved some weight.)=A0 Anyway, when it passes 25 hours, I'll post=A0a= nother 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-4mike@cox.net> wrote:

Mark,

=A0

=A0Any update on the DNA muffler?=

=A0

Mike Wills

RV-4 N144MW

----- Original Message -----

=

From: Mark Steitle

Sent: Friday, January 16, 2009 7:05 AM

Subject: [FlyRotary] DNA Muffler

=A0

Does anyone on the list=A0have any=A0real-life rotary experience with=A0= the DNA Gen II muffler (http://www.dnamufflers.com/DNA/main_DNA.html)?= =A0 It is an interesting design in that it has no packing material to burn = out.=A0 Instead, it utilizes ladder-rungs, which they call "internal s= ound diffusers",=A0which resemble a chain of DNA down through the cent= er of the muffler body, which is made of 304 SS.=A0 Their web site claims t= hat the racers use them with great success.=A0 From speaking with a sales r= ep, they claim there the rotary crowd uses them too.=A0 I'm considering= purchasing one of their FULL THROTTLE COLLECTOR mufflers (P/N 1040), but t= hought I would check=A0to see if anyone else has used this style muffler.= =A0 This muffler has a 3" inlet/outlet with a 4" body.=A0 So it i= s compact enough to fit inside=A0my cowl.=A0 My exhaust header has a 3"= ; swivel joint, so it should be a good fit.=A0

=A0

Mark S.

=A0

=A0

=A0


--0015175cb81e5e762d0464d7025a--