X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3879630 for flyrotary@lancaironline.net; Thu, 08 Oct 2009 19:27:39 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta02.mail.rr.com with ESMTP id <20091008232703637.GTVH18886@cdptpa-omta02.mail.rr.com> for ; Thu, 8 Oct 2009 23:27:03 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Your Muffler Date: Thu, 8 Oct 2009 19:28:04 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01CA484D.77150B70" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: AcpIZnFozAQrao1hR32QuvTNd4IT1AAB//fw In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20091008232703637.GTVH18886@cdptpa-omta02.mail.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_0019_01CA484D.77150B70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Lynn is correct. In fact the photos I showed of my "Fan" muffler showed some of the fan blades had been failed due to fatique and the fact they were unsupported at the tips. That is one of the reasons I had a section of perforated tube coming out of the back of the muffler. The theory (hope?) was that if the debris (fan blades) didn't get blow out the end of the tube, the perforated tubing would permit exhaust gas to continue to flow. Even though the design did shed a few blades either they apparently worked there way through and out. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Lynn Hanover Sent: Thursday, October 08, 2009 6:26 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Your Muffler Ed, > Cones are the GO. > > Any bare edge will take a battering from the heat and shock waves. Cones > formed back to back eliminate any edges. > > There must be supporting structure for the cones, I've used 1/4" solid > round bar welded into the exhaust skin. > George (down under) Thought must be applied to the idea that eventually the structure will decompose, and then the pieces thus liberated, will plug the exit and render the engine a balance weight. As in the Mistral crash. Perhaps the back to back cones could be installed over some cooling air holes in the central pipe. A solid rod just aft of the cones could support the central pipe and help prevent such a blockage. My version would have the entire muffler below the cowl in the airstream. Maybe there would be room for a collector before the muffler so as to maintain more engine power. Lynn E. Hanover ------=_NextPart_000_0019_01CA484D.77150B70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Lynn is correct.

 

In fact the photos I showed of my = “Fan” muffler showed some of the fan blades had been failed due to fatique and = the fact they were unsupported at the tips.  That is one of the reasons = I had a section of perforated tube coming out of the back of the muffler.  The = theory (hope?) was that if the debris (fan blades) didn’t get blow out the end of = the tube, the perforated tubing would permit exhaust gas to continue to = flow.  Even though the design did shed a few blades either they apparently worked = there way through and out.

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Lynn Hanover
Sent: Thursday, October = 08, 2009 6:26 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Your Muffler

 

 Ed,
> Cones are the GO.
>
> Any bare edge will take a battering from the heat and shock waves. = Cones
> formed back to back eliminate any edges.
>
> There must be supporting structure for the cones, I've used = 1/4" solid
> round bar welded into the exhaust skin.
> George (down under)

Thought must be applied to the idea that eventually the structure will decompose, and then the pieces thus liberated, will plug the exit and = render the engine a balance weight. As in the Mistral crash. =

 

Perhaps the back to back cones could be installed over some = cooling air holes in the central pipe.

A solid rod just aft of the cones could support the central pipe = and help prevent such a blockage.

 

My version would have the entire muffler below the cowl in the airstream. Maybe there would be room for a collector before the muffler = so as to maintain more engine power.

 

Lynn E. Hanover

 

 

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