X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-gw0-f52.google.com ([74.125.83.52] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4216255 for flyrotary@lancaironline.net; Fri, 09 Apr 2010 20:27:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.83.52; envelope-from=msteitle@gmail.com Received: by gwj23 with SMTP id 23so1932759gwj.25 for ; Fri, 09 Apr 2010 17:26:33 -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:received:message-id:subject:from:to:content-type; bh=P78yWZFgoeQICGPm12IeF4u0Z8qeuPcoIMG8jyLiHrg=; b=dSWAUcN1EYMtJDhwVyXbG9Xh4rKPhav1jUCHF6rds7z91hz4dPkNP5NtXzwcjET8gT yPxfNl1h4IGnOFA1CUftk0rbZZ3cbGc1O882x2/WIDYOj7iLQxpGViDTRE8AUlGUpWRb kEbJXG4iGlbjGD0Jh4Z4veu6ufJSuesD1KBW0= 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=nc5Eq/IzdkUMUbbi0aX8xPWBURUepRtfI1oM5UfCwtkBS3SA4eiY8KlkyF/M5Friei 0YQCrP90VXjC6G59agEtsWpfnN1A5QP4LXdvbTwDNcAbhNlIgD2MJZ1fq4W3HsriO7v2 CVysjymlZdefBshDh39nPqkGg3dl+NF26q8uc= MIME-Version: 1.0 Received: by 10.231.183.195 with HTTP; Fri, 9 Apr 2010 17:26:33 -0700 (PDT) In-Reply-To: References: Date: Fri, 9 Apr 2010 19:26:33 -0500 Received: by 10.100.25.34 with SMTP id 34mr1023418any.187.1270859193311; Fri, 09 Apr 2010 17:26:33 -0700 (PDT) Message-ID: Subject: Re: [FlyRotary] Re: Tangential muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016e6468feac6e1140483d6f6cb --0016e6468feac6e1140483d6f6cb Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Al, Per Lynn H., the p-port is very sensitive to exhaust back pressure. So, I made sure to put lots of V-shaped slots in the inner pipe, 109 to be exact. My goal with my tangential muffler design was to dissipate the exhaust hea= t energy, chop up the exhaust pulses into small pieces while minimizing back pressure. The jury is still out as to how successful I was at meeting thes= e three goals, but my initial impressions are favorable. Mark On Fri, Apr 9, 2010 at 12:29 PM, Al Gietzen wrote: > I=92d expect it to be very effective. > > Is the total area of the slots =3D or > than the x-section of the 2 =BD= =94 pipe? > > Is the P-port less sensitive to exhaust back pressure? > > > > Al > > > > -----Original Message----- > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *O= n > Behalf Of *Mark Steitle > *Sent:* Friday, April 09, 2010 7:47 AM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: Tangential muffler > > > > Al, > > > > The slotted tube exits through the aft end of the muffler. It is 2-1/2" > the whole way. I slotted it after I was unable to drill holes through th= e > SS. Cutting 1" slits was very easy. After making the cuts, I took a ham= mer > and chisel and made a "V" shaped indent on one side of the cut to increas= e > the exit area provided by each cut and to encourage the exhaust gasses to > flow toward the exit. Seems to be working. I'll take some sound > measurements a little later on. > > > > Mark > > On Fri, Apr 9, 2010 at 11:13 AM, Al Gietzen wrote: > > I should make it clear that my tangential muffler uses a slotted tube tha= t > runs down through the length of the 5" tube. This tube is also inconel a= nd > is welded to both ends, thereby adding strength to the flat ends. I > utilized Lynn's coupling design to allow for movement between the muffler > and the engine. > > > > Mark; > > This is interesting. Would you care to give a bit more info =96 or perha= ps > provide a sketch? Where is the exit from the muffler? Does the exhaust ex= it > through the slotted tube? How big is the tube? > > > > Al > > > --0016e6468feac6e1140483d6f6cb Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Al,=A0

Per Lynn H., the p-port is very sensitive to exha= ust back pressure. =A0So, I made sure to put lots of V-shaped slots in the = inner pipe, 109 to be exact. =A0My goal with my tangential muffler design w= as to dissipate the exhaust heat energy, chop up the exhaust pulses into sm= all pieces while minimizing back pressure. =A0The jury is still out as to h= ow successful I was at meeting these three goals, but my initial impression= s are favorable.

Mark

=A0=A0

On Fri, Apr 9, 2010 at 12:29 PM, Al Gietzen <ALVentures@cox.net> wrote:

I=92d expect i= t to be very effective.

Is the total a= rea of the slots =3D or > than the x-section of the 2 =BD=94 pipe?

Is the P-port = less sensitive to exhaust back pressure?

=A0

Al

=A0

<= /font>

-----Original = Message-----
From: Rotary motors in aircr= aft [mailto:fl= yrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Friday, April 09, 2010= 7:47 AM
To: Rotary motors in aircraf= t
Subject: [FlyRotary] Re: Tangential muffler

=A0

Al,=A0

=A0

The slotted tube exits th= rough the aft end of the muffler. =A0It is 2-1/2" the whole way. =A0I slotted it after I was unable to drill holes through the SS. =A0Cutting 1" slits was very easy. =A0After making the cuts, I took a hammer and chisel and made a "V" shaped indent on one side of the cut to increase the exit are= a provided by each cut and to encourage the exhaust gasses to flow toward the exit. =A0Seems to be working. =A0I'll take some sound measurements a little later on.

=A0

Mark

On Fri, Apr 9, 2010 at 11= :13 AM, Al Gietzen <ALVentures@cox.net> wrote:

I should make it clear t= hat my tangential muffler uses a slotted tube that runs down through the length of the 5" tube. =A0Th= is tube is also inconel and is welded to both ends, thereby adding strength to= the flat ends. =A0I utilized Lynn's coupling design to allow for movement between the muffler and the engine. =A0

=A0

Mark;

This is interesting.=A0 Would you care to give a bit more info =96 or perhaps provide a sketch? Where is the exit from the muffler? Does the exhaust exit through the slotted tube? How big is the tube?

=A0

Al

=A0


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