X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qmta09.emeryville.ca.mail.comcast.net ([76.96.30.96] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4217714 for flyrotary@lancaironline.net; Sun, 11 Apr 2010 16:40:37 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.96; envelope-from=wschertz@comcast.net Received: from omta10.emeryville.ca.mail.comcast.net ([76.96.30.28]) by qmta09.emeryville.ca.mail.comcast.net with comcast id 4DqM1e0060cQ2SLA9Lg2ok; Sun, 11 Apr 2010 20:40:02 +0000 Received: from WschertzPC ([71.57.77.95]) by omta10.emeryville.ca.mail.comcast.net with comcast id 4Lfs1e00D23NHuF8WLfvzX; Sun, 11 Apr 2010 20:39:56 +0000 Message-ID: <7E24BAA31E224D3A92D72A90D31BA8B3@WschertzPC> From: "Bill Schertz" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Tangential muffler Date: Sun, 11 Apr 2010 15:39:51 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003B_01CAD98D.39C15C70" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 This is a multi-part message in MIME format. ------=_NextPart_000_003B_01CAD98D.39C15C70 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Could you post a picture of the internal pipe, in fact of all the parts? Bill Schertz KIS Cruiser #4045 N343BS Phase I testing From: Mark Steitle=20 Sent: Friday, April 09, 2010 7:26 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Tangential muffler Al, =20 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 heat 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 these three goals, but my initial impressions are = favorable. Mark =20 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] = On Behalf Of Mark Steitle Sent: Friday, April 09, 2010 7:47 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Tangential muffler Al,=20 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 the SS. Cutting 1" slits was very easy. After 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 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 = that runs down through the length of the 5" tube. This tube is also = inconel and 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. =20 Mark; This is interesting. 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? Al ------=_NextPart_000_003B_01CAD98D.39C15C70 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Could you post a picture of the = internal pipe, in=20 fact of all the parts?
Bill Schertz
KIS Cruiser=20 #4045
N343BS
Phase I testing

Sent: Friday, April 09, 2010 7:26 PM
Subject: [FlyRotary] Re: Tangential = muffler

Al, =20

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=20 exact.  My goal with my tangential muffler design was to dissipate = the=20 exhaust heat energy, chop up the exhaust pulses into small pieces while=20 minimizing back pressure.  The jury is still out as to how = successful I was=20 at meeting these three goals, but my initial impressions are = favorable.

Mark

  

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

I=92d = expect it to be=20 very effective.

Is the = total area=20 of the slots =3D or > than the x-section of the 2 =BD=94 = pipe?

Is the = P-port less=20 sensitive to exhaust back pressure?

 

Al

 

-----Original Message-----
From: Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On Behalf Of Mark = Steitle
Sent: Friday, April 09, 2010 = 7:47=20 AM
To: Rotary = motors in=20 aircraft
Subject:=20 [FlyRotary] Re: Tangential muffler

 

Al, 

 

The slotted = tube exits=20 through the aft end of the muffler.  It is 2-1/2" the whole way. =  I=20 slotted it after I was unable to drill holes through the SS. =  Cutting 1"=20 slits was very easy.  After making the cuts, I took a hammer and = chisel=20 and made a "V" shaped indent on one side of the cut to increase the = exit area=20 provided by each cut and to encourage the exhaust gasses to flow = toward the=20 exit.  Seems to be working.  I'll take some sound = measurements a=20 little later on.

 

Mark

On Fri, Apr = 9, 2010 at=20 11:13 AM, Al Gietzen <ALVentures@cox.net> wrote:

I should make = it clear=20 that my tangential muffler uses a slotted tube that runs down through = the=20 length of the 5" tube.  This tube is also inconel and is welded = to both=20 ends, thereby adding strength to the flat ends.  I utilized = Lynn's=20 coupling design to allow for movement between the muffler and the = engine.=20  

 

Mark;

This is=20 interesting.  Would you care to give a bit more info =96 or = perhaps provide=20 a sketch? Where is the exit from the muffler? Does the exhaust exit = through=20 the slotted tube? How big is the tube?

 

Al

 

=

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