X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from web46404.mail.sp1.yahoo.com ([68.180.199.193] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with SMTP id 4218869 for flyrotary@lancaironline.net; Mon, 12 Apr 2010 14:20:27 -0400 Received-SPF: none receiver=logan.com; client-ip=68.180.199.193; envelope-from=dwayneparkinson@yahoo.com Received: (qmail 58887 invoked by uid 60001); 12 Apr 2010 18:19:53 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1271096393; bh=eGr9J6rKB0qz6/TjGPUQtSsGRc7MsXCmgB3y7tKm3EI=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=c3vavvIyJbnJ/BYWNg7T5A67ZOiI/RYPjxkdgWsoaexg94BMD5KwL640yh/U4mOg5TbeK5ZjLTR/VVzOyzHiElDqAgVaPUUU6EaiCDVVTI/sKIVeZWnBKydUW+E8salIys1fwMX52+UTt0iJqA3Z0sMWTSFbX6RLXb44dG3VRI8= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=E3CIUrv0tWXmN13n0ZCXiO6fGQToyPn9sEFkZx2iixcedJJJsxYfNiuXzNiPW9YHt/WsS06Ioxo/RPBaFUqIyiiKNiTr82nnYH/MtOZTSZAR1HeBJ2N9SNsksC5k4opKTOUU0tCjTw1mGb8rpTIDOtUKgrjfJ19Mjf/9RuwGgxA=; Message-ID: <116178.58791.qm@web46404.mail.sp1.yahoo.com> X-YMail-OSG: FKgTg1MVM1nNGSoqU9y._I8fVcgOavTIZtzqID.wta.NnGU2lxOZnl6dJ9t8kpgnj072aYG9lI4Timrtil4gppFfTk_AkSTVfZlKjQO4jzXYystCjS7IjVk2pzmvZtQAIxLqi5jqcwYJ9CGPC4uN.UsWpFhOEb4IR6V5TXHevvhJUYlmvkrWEgMR03R7MHO_OmBaRRI0RsSj2qLOV24NEwlNi6r.rT65R59rkvbK1Ntc4kwMkc3bD01bPcZcDGqjZS_6XaA2b4CEGI5ImQE_4PU3xfZ2Ai.oP3ZD7AmidQKWZznbnwbrkXWm.LWB6lth7NkzTlZQ Received: from [24.177.130.10] by web46404.mail.sp1.yahoo.com via HTTP; Mon, 12 Apr 2010 11:19:52 PDT X-Mailer: YahooMailRC/348.3 YahooMailWebService/0.7.361.4 References: Date: Mon, 12 Apr 2010 11:19:52 -0700 (PDT) From: Dwayne Parkinson Subject: Re: Tangential muffler To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-200393157-1271096392=:58791" --0-200393157-1271096392=:58791 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable This is a very interesting approach. Thanks for posting the pictures. It = would be very interesting (at least to me) to measure the exhaust gas pulse= s at the tail pipe with this design. I wonder if it will normalize the pul= ses at all so you have an almost steady stream of exhaust gases coming out = of the pipe.=0A=0A=0A=0A=0A=0A________________________________=0AFrom: Al G= ietzen =0ATo: Rotary motors in aircraft =0ASent: Mon, April 12, 2010 10:24:07 AM=0ASubject: [FlyRotar= y] Re: Tangential muffler=0A=0A =0A =0A =0AErnest;=0A =0AI agree that the g= eometry of the geometry of the cuts is=0Acertainly not ideal; and if it wer= e 321SS or similar; yes, I=E2=80=99d expect it=0Awould it to disintegrate i= n about 50 hrs or less. But inconel is very=0Acorrosion resistant and very= strong up to 2000+F. There will be some=0Aself-annealing of the stresses = at 1700F. It would be interesting to know=0Awhat temp it actually gets to = because there is some expansion cooling of the=0Agases in the muffler.=0A = =0AAlso it is very tough stuff =E2=80=93 trying to drill or file=0Ainconel = will just wear out the tools. Holes have to be punched, cut with=0Awater j= et, or some other technique.=0A =0AIt will be interesting to see how it sta= nds up; but I=0Athink it has a good chance to prove to be quite durable.=0A= =0AAl=0A =0AA=0Agrinder will leave two fairly severe 90 degree corners on = every edge =0Aof=0Athe cut slot. Compounding this is the fact that the sid= e grinder =0Acuts=0Aa circle. The end of each slot will be left with a kni= fe edge =0Aprofile=0Apointing back toward the slot. This will create some = mean =0Astress=0Arisers. The expectation is that this tube is to live in a= n =0Aenvironment=0Athat has to be the closest thing to hell on Earth we cou= ld =0Aimagine=0A(extreme heat and constant sonic blasts).=0A =0AI=0Awould h= ave suggested drilling 3/16" holes and connecting them with the =0Agrinder.= =0AUnless the inside tube is fabricated different than what I =0Aunderstan= d,=0AI can't help but to think that it will have a very short =0Alife. =0AC= racks will start in the corners of each slot, and the tube will =0Adisinteg= rate.=0ACan it be easily pulled apart so that you could run a =0Around=0Ane= edle file down both sides of all the slots to round them out?=0A =0A--=0AHo= mepage: http://www.flyrotary.com/=0AArchive=0Aand UnSub: http://mail.lan= caironline.net:81/lists/flyrotary/List.html=0A=0A=0A --0-200393157-1271096392=:58791 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
This is a very interesting approach.  Thanks for posting the= pictures.  It would be very interesting (at least to me) to measure t= he exhaust gas pulses at the tail pipe with this design.  I wonder if = it will normalize the pulses at all so you have an almost steady stream of = exhaust gases coming out of the pipe.



From: Al Gietzen <ALVentures@cox.net>
<= b>To: Rotary motors in aircra= ft <flyrotary@lancaironline.net>
Sent: Mon, April 12, 2010 10:24:07 AM
Subject: [FlyRotary] Re: Tangential muff= ler

=0A=0A=0A=0A =0A=0A=0A =0A=0A=0A=0A=0A=0A=0A=0A
= =0A=0A

 

=0A=0A

 

=0A=0A

Er= nest;

=0A=0A

 

=0A= =0A

I agree that the geometry of the= geometry of the cuts is=0Acertainly not ideal; and if it were 321SS or sim= ilar; yes, I=E2=80=99d expect it=0Awould it to disintegrate in about 50 hrs= or less.  But inconel is very=0Acorrosion resistant and very strong u= p to 2000+F.  There will be some=0Aself-annealing of the stresses at 1= 700F.  It would be interesting to know=0Awhat temp it actually gets to= because there is some expansion cooling of the=0Agases in the muffler.

=0A=0A

 

=0A=0A

<= span style=3D"font-size:11.0pt;font-family:Verdana;">Also it is very tough = stuff =E2=80=93 trying to drill or file=0Ainconel will just wear out the to= ols.  Holes have to be punched, cut with=0Awater jet, or some other te= chnique.

=0A=0A

&nbs= p;

=0A=0A

It will = be interesting to see how it stands up; but I=0Athink it has a good chance = to prove to be quite durable.

=0A=0A

 

=0A=0A

Al

=0A=0A

 

=0A=0A

A=0Agrinder will leave two fairly severe 90 d= egree corners on every edge

=0A=0A

of=0A= the cut slot.  Compounding this is the fact that the side grinder

=0A=0A

cuts=0Aa circle.  The end of eac= h slot will be left with a knife edge

=0A=0A

profile=0Apointing back toward the slot.  This will create some m= ean

=0A=0A

stress=0Arisers.  The ex= pectation is that this tube is to live in an

=0A=0A

environment=0Athat has to be the closest thing to hell on Earth= we could

=0A=0A

imagine=0A(extreme heat= and constant sonic blasts).

=0A=0A

 = ;

=0A=0A

I=0Awould have suggested drillin= g 3/16" holes and connecting them with the

=0A=0A

grinder. =0AUnless the inside tube is fabricated different t= han what I

=0A=0A

understand,=0AI can't = help but to think that it will have a very short

=0A=0Alife. =0ACracks will start in the corners of each slot= , and the tube will

=0A=0A

disintegrate.= =0ACan it be easily pulled apart so that you could run a

= =0A=0A

round=0Aneedle file down both sides of all the slot= s to round them out?

=0A=0A

 =

=0A=0A

--

=0A=0A

Homepage: =0Ahttp://www.flyrotary.com/

=0A=0A

Archive=0Aand UnSub:  =0Ahttp://m= ail.lancaironline.net:81/lists/flyrotary/List.html=

=0A=0A
=0A=0A=0A=0A=0A
=0A=0A=0A

=0A=0A=0A=0A --0-200393157-1271096392=:58791--