X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost01.isp.att.net ([207.115.11.51] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3882138 for flyrotary@lancaironline.net; Sat, 10 Oct 2009 22:57:36 -0400 Received-SPF: none receiver=logan.com; client-ip=207.115.11.51; envelope-from=keltro@att.net DKIM-Signature: v=1; q=dns/txt; d=att.net; s=dkim01; i=keltro@att.net; a=rsa-sha256; c=relaxed/relaxed; t=1255229857; h=Content-Type: MIME-Version:In-Reply-To:Message-Id:Date:Subject:To:From; bh=xvfq/V HhA0GpJlgod74//0n1Gh9s1mnx+msfEMXiTLQ=; b=GaziPEmmEeRsS3vERc/wnEOUE LIhCbq619sDVCyBrUs/9Quj+1Ih3DlkoZFBhaARUVzX0VcBFv67l11deFMG9g== Received: from fwebmail04.isp.att.net ([207.115.11.154]) by isp.att.net (frfwmhc01) with SMTP id <20091011025700H0100h9su7e>; Sun, 11 Oct 2009 02:57:00 +0000 X-Originating-IP: [207.115.11.154] Received: from [208.114.34.50] by fwebmail04.isp.att.net; Sun, 11 Oct 2009 02:57:00 +0000 From: "Kelly Troyer" To: "Rotary motors in aircraft" Subject: Your Muffler Date: Sun, 11 Oct 2009 02:57:00 +0000 Message-Id: <101120090257.27216.4AD1497C00075F6D00006A5022216128369B0A02D29B9B0EBF019D9B040A05@att.net> In-Reply-To: X-Mailer: AT&T Message Center Version 1 (Mar 2 2009) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_27216_1255229820_0" --NextPart_Webmail_9m3u9jl4l_27216_1255229820_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Lynn, What is your opinion how power would be effected by splitting the exhaust again for two mufflers after the collector ??................... -- Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold -------------- Original message from Lynn Hanover : -------------- 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_Webmail_9m3u9jl4l_27216_1255229820_0 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_27216_1255229820_1" --NextPart_Webmail_9m3u9jl4l_27216_1255229820_1 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Lynn,

What is your opinion how power would be effected by splitting t= he exhaust again for two

mufflers after the collector ??...................

--
Kelly Troyer
"Dyke Delta"_1= 3B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifol= d

-------------- Original message from Lynn Hanover <lehano= ver@gmail.com>: --------------

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

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

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

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

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

Lynn E. Hanover

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