X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f17.google.com ([209.85.221.17] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3471773 for flyrotary@lancaironline.net; Sun, 01 Feb 2009 22:19:54 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.221.17; envelope-from=msteitle@gmail.com Received: by qyk10 with SMTP id 10so2531761qyk.19 for ; Sun, 01 Feb 2009 19:19:19 -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=baXjPQn5jPath7LgWsBiWXd8Bvp2/K6U8La9S8gcFDA=; b=anR6ARJqiYpfu1qHOdt5FNK+WHAbyhIVe50SWRk0je+mDG2FUdMwQUANMmphe3FfXj W8ftHYw7ZtGdNvSNVe8x2TB21sNGJzztQZFjh2y0j6es5gCB5UOQzkE8TJfAN8hXK/uE 3+8LTEuaRhgy05RV+9581x+onniFcgkfggLUs= 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=oS74KyksSV2QOy3//4vNaGoD9JRZapyDKXp5llpP9AZrj1HYZf+uXPg6f6R5tV8zf0 RsdPZmEbRKIgATFhf7ULtZ5HoIqZOr4+NCDr1ZTmD144OYvxeXfJCHHiFvliWmMQt5Z/ XU/2hxk/Xk6z7v09N440ZIeU2uDVSRLavj44k= MIME-Version: 1.0 Received: by 10.214.26.1 with SMTP id 1mr5420311qaz.334.1233544757633; Sun, 01 Feb 2009 19:19:17 -0800 (PST) In-Reply-To: References: Date: Sun, 1 Feb 2009 21:19:17 -0600 Message-ID: <5cf132c0902011919k55d2aacdu1f3d434d8aab9275@mail.gmail.com> Subject: Re: [FlyRotary] Re: My New DNA Muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cb58017e1dc0461e70530 --0015175cb58017e1dc0461e70530 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Richard, I think you're right on with your comment. I cobbled up the new muffler onto the old manifold and ran it up to 4000 rpm today. At 1500-1600, the noise level inside the a/c was ~89 db, at 4000 it was 102db. It wasn't any noisier than the burned out Hushpower II, but it wasn't much quieter either. Unfortunately, with the setup I had, I didn't want to run it any harder, but it did seem to work better the faster I ran the engine. It wouldn't be any trouble to neck down the exit from 3" to 2". More on that later... Mark S. On Sat, Jan 31, 2009 at 9:09 AM, Richard Sohn wrote: > With the inlet and outlet the same size, I would not be surprised if it > does very little noise reduction, if any. Some tests in the past have shown > that a smaller exit makes a considerable difference in sound level with > moderate loss of power. > FWIW. > > Richard Sohn > N2071U > > ----- Original Message ----- > *From:* Mark Steitle > *To:* Rotary motors in aircraft > *Sent:* Saturday, January 31, 2009 8:48 AM > *Subject:* [FlyRotary] My New DNA Muffler > > Hey Guys, > > My new DNA muffler arrived yesterday so I thought I would post a couple of > pictures with some information and first impressions. > It appears to be very well built, all tig welded, and no packing to burn > out. It weighs just under 5#, which is half of what the Hushpower II > weighs, so if it works, I will have reduced my fwf weight by 5#. To be > totally honest, my HPII probably no longer weighs 10# as most of the innards > have long departed the a/c. > > The model I purchased was the Gen II - Collector Series, p/n 1040. It has > 3" inlet and 3" outlet, with a 4" dia. body. Total length is21", body > length is 15". Literature says that it is good for 1000 hp, so it may have > a chance of lasting at least 100 hrs on my 3-rotor running for hours at > WOT. We'll have to wait and see on the longevity. I have a decible meter, > so I can take some before and after readings. Cost was $152 with shipping > from Canada. > > I'm going out to the airport this morning to see how well it fits. More on > how well it fits & works later... > > Mark S. > > ------------------------------ > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > ------------------------------ > > > No virus found in this incoming message. > Checked by AVG - http://www.avg.com > Version: 8.0.176 / Virus Database: 270.10.16/1926 - Release Date: 1/30/2009 > 5:31 PM > > --0015175cb58017e1dc0461e70530 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Richard,

I think you're right on with your comment.  I cob= bled up the new muffler onto the old manifold and ran it up to 4000 rpm tod= ay.  At 1500-1600, the noise level inside the a/c was ~89 db, at 4000 = it was 102db.  It wasn't any noisier than the burned out Hushpower= II, but it wasn't much quieter either.  Unfortunately, with the s= etup I had, I didn't want to run it any harder, but it did seem to work= better the faster I ran the engine.  It wouldn't be any trouble t= o neck down the exit from 3" to 2".  More on that later...
Mark S.
 

On Sat, Jan 31, 20= 09 at 9:09 AM, Richard Sohn <res12@fairpoint.net> wrote:
With the inlet and outlet the same siz= e, I would=20 not be surprised if it does very little noise reduction, if any. Some tests= in=20 the past have shown that a smaller exit makes a considerable difference in = sound=20 level with moderate loss of power.
FWIW.
 
Richard Sohn
N2071U
----- Original Message -----
From:=20 Mark Steitle=20
Sent: Saturday, January 31, 2009 8= :48=20 AM
Subject: [FlyRotary] My New DNA=20 Muffler

Hey Guys,

My new DNA muffler arrived yesterday so I= =20 thought I would post a couple of pictures with some information and first= =20 impressions.
 It appears to be very well built, all tig welded, a= nd no=20 packing to burn out.  It weighs just under 5#, which is half of what= the=20 Hushpower II weighs, so if it works, I will have reduced my fwf weight by= =20 5#.  To be totally honest, my HPII probably no longer weighs 10# as = most=20 of the innards have long departed the a/c. 

The model I purc= hased=20 was the Gen II - Collector Series, p/n 1040.  It has 3" inlet a= nd 3"=20 outlet, with a 4" dia. body.  Total length is21", body len= gth is=20 15".  Literature says that it is good for 1000 hp, so it may ha= ve a=20 chance of lasting at least 100 hrs on my 3-rotor running for hours at=20 WOT.  We'll have to wait and see on the longevity.  I have = a decible=20 meter, so I can take some before and after readings.  Cost was $152 = with=20 shipping from Canada.

I'm going out to the airport this mornin= g to see=20 how well it fits.  More on how well it fits & works later...=20

Mark S.

--
Homepage:  http://www.flyrotary.com/
Archive = and=20 UnSub:  =20 http://mail.lancaironline.net:81/lists/flyrotary/List.html


No virus found in this incoming message.
Checked by AVG -= =20 http://www.avg.com
Version: 8.0.176 / Virus Database: 270.10.1= 6/1926 -=20 Release Date: 1/30/2009 5:31 PM

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