X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f227.google.com ([209.85.218.227] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3872719 for flyrotary@lancaironline.net; Fri, 02 Oct 2009 19:50:00 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.227; envelope-from=msteitle@gmail.com Received: by bwz27 with SMTP id 27so1387907bwz.19 for ; Fri, 02 Oct 2009 16:49:22 -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=YriFUjFn/P0fsimTMJrd5lPgYAjfjRkjgrciTh1tdgw=; b=MtdNWLfIPzIu7jdPtsRm+UOA7NGZv31PrfeW5vpjBnJapYKammjrwYIxsZ0SaBQbie gdZKzfhonV7j+xqaFAi3Y3z62KdE4E9qDUscuLqBXStqZ3WCs4fClU4vhGm5b4lkC9dR ewb2Bsida1xOhJx3a6N8bczPX0CLIFGRhYesM= 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=cXqngaCTXyXaA9x8wFpYvmDlXAY1iLmrD32Vo2s1WZMVJgyy8C3T2fLhUAIQOocjfo FmKXrrszE4eNfP/9zfQJKSXd6wtj2W65xsQamp7R3TK5YIL0/qKG+CFRjH+Nofa5jssx 4C0Z6DjNgd4SKn+hjyHymJRTWz38fv/jWW2vY= MIME-Version: 1.0 Received: by 10.204.153.219 with SMTP id l27mr1681104bkw.141.1254527362700; Fri, 02 Oct 2009 16:49:22 -0700 (PDT) In-Reply-To: References: Date: Fri, 2 Oct 2009 18:49:22 -0500 Message-ID: <5cf132c0910021649o607c5e10kd71c27fa6a37cc8a@mail.gmail.com> Subject: Re: [FlyRotary] Re: Tangential Manifold/Muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cf9f6d095cb0474fc69a5 --0015175cf9f6d095cb0474fc69a5 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Al, Could you post a sketch of your secondary muffler? 6db is a significant reduction, especially considering the small size of the can. Mark On Fri, Oct 2, 2009 at 3:27 PM, George Lendich wrote= : > Al it seems to me that a lot of people are having success with using a > duel muffler system/ or secondary muffler. > George ( down under) > > Mark; > > > > Yes; I have a tangential muffler. It is light weight, does a nice job of > quieting things down, and based on dyno results, has little if any power > penalty. It is made of .045=94 inconnel; 5 inches in diameter, and has w= orked > great for 150 hours on my 20B. I have internal vanes on the inside oppos= ite > the ports at 45 degree angle to help break up the pulses, and help direct > the exhaust toward the exit at the aft end, which is conical down to a 2 = =BE > exit pipe. > > > > I also have a secondary SS muffler of my own design which knocks another = 6 > db off the noise. > > > > I think one advantage of the tangential muffler approach is the expansion > of the gases close to the port, and although not computable due to other > variables, probably immediately drops the temp somewhat in accordance wit= h > Charles Law. > > > > Best, > > Al G > > > > -----Original Message----- > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *O= n > Behalf Of *Mark Steitle > *Sent:* Thursday, October 01, 2009 7:36 AM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: Quiet is Deafening > > > > Kelly, > > > > You just need to fly at Mach 1 so you stay ahead of the sound. ;-) > > > > Can anyone report on the effectiveness of the tangential muffler in actua= l > real world situations? (As I recall Al G. is running a tangential muffle= r > on his Velocity.) I ask because I'm in the process of building one for m= y > Lancair with the hopes that it will work better than the DNA muffler that > I'm currently running. I think it will work better at reducing the noise > level in the cabin, but at what cost to power? Hopefully, this will save= me > the cost of a new Zulu ANR headset. Comments appreciated. > > > > Mark S. > > On Wed, Sep 30, 2009 at 10:01 PM, Mike Wills wrote: > > Kelly, > > > > If you think the quiet is deafening go fly behind a rotary - now thats > deafening! > > > > Mike Wills > > RV-4 N144MW > > ----- Original Message ----- > > *From:* Kelly Troyer > > *To:* Rotary motors in aircraft > > *Sent:* Wednesday, September 30, 2009 7:15 AM > > *Subject:* [FlyRotary] Quiet is Deafening > > > > Anyone out there ??.....................<:) > > -- > Kelly Troyer > "Dyke Delta"_13B ROTARY Engine > "RWS"_RD1C/EC2/EM2 > "Mistral"_Backplate/Oil Manifold > > > > > -------------- Original message from "Patrick Panzera" < > panzera@experimental-aviation.com>: -------------- > > Hey gang! > > > > I came across a rare find this weekend. > > Any serious rotorhead will certainly appreciate this. > > > > Bluelines from 1973 of the General Motors Wankel Rotary engine. > > > > I just put them up on eBay > > > > http://tinyurl.com/GM-Rotary-drawings > > > > Pat > > > > > > --0015175cf9f6d095cb0474fc69a5 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Al,
=A0
Could you post a sketch of your secondary muffler?=A0 6db is a signifi= cant reduction, especially considering the small size of the can.
=A0
Mark

On Fri, Oct 2, 2009 at 3:27 PM, George Lendich <= span dir=3D"ltr"><lendich@aanet.= com.au> wrote:
=A0Al it seems to me that a lot of peo= ple are having success with using a duel muffler system/ or secondary muffl= er.
George ( down under)

Mark;

=A0

Yes; I have a tangential muffle= r. =A0It is light weight, does a nice job of quieting things down, and base= d on dyno results, has little if any power penalty. =A0It is made of .045= =94 inconnel; 5 inches in diameter, and has worked great for 150 hours on m= y 20B. =A0I have internal vanes on the inside opposite the ports at 45 degr= ee angle to help break up the pulses, and help direct the exhaust toward th= e exit at the aft end, which is conical down to a 2 =BE exit pipe.

=A0

I also have a secondary SS muff= ler of my own design which knocks another 6 db off the noise.=

=A0

I think one advantage of the ta= ngential muffler approach is the expansion of the gases close to the port, = and although not computable due to other variables, probably immediately dr= ops the temp somewhat in accordance with Charles Law.

=A0

Best,

Al G

=A0

-----Original Message-----
From: Rotary motors in aircra= ft [mailto:flyrotary@lancaironline.net] On B= ehalf Of Mark Steitle
Sent: Thursday, October 01, 2009 7:36 AM
To: Rotary motors in aircra= ft
Subject: [FlyRotary] = Re: Quiet is Deafening

<= span style=3D"FONT-SIZE: 12pt">=A0

<= span style=3D"FONT-SIZE: 12pt">Kelly,

<= span style=3D"FONT-SIZE: 12pt">=A0

<= span style=3D"FONT-SIZE: 12pt">You just need to fly at Mach 1 so you stay a= head of the sound.=A0 ;-)

<= span style=3D"FONT-SIZE: 12pt">=A0

<= span style=3D"FONT-SIZE: 12pt">Can anyone report on the effectiveness of th= e tangential muffler in actual real world situations?=A0 (As I recall Al G.= is running a tangential muffler on his Velocity.)=A0 I ask because I'm= in the process of building one for my Lancair with the hopes that it will = work better than the DNA muffler that I'm currently running.=A0 I think= it will work better at reducing the noise level in the cabin, but at what = cost to power?=A0 Hopefully, this will save me the cost of a new Zulu ANR h= eadset.=A0 Comments appreciated.

<= span style=3D"FONT-SIZE: 12pt">=A0

Mark= S.

<= span style=3D"FONT-SIZE: 12pt">On Wed, Sep 30, 2009 at 10:01 = PM, Mike Wills <rv= -4mike@cox.net> wrote:

Kelly,

<= span style=3D"FONT-SIZE: 12pt">=A0

=A0If you think the quiet is deafe= ning go fly behind a rotary - now thats deafening!

<= span style=3D"FONT-SIZE: 12pt">=A0

= Mike Wills

= RV-4 N144MW

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

From: Kelly Troyer

<= span style=3D"FONT-SIZE: 12pt">=A0


--0015175cf9f6d095cb0474fc69a5--