X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.12.143.101] (HELO imo-m13.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3412049 for flyrotary@lancaironline.net; Mon, 05 Jan 2009 17:00:16 -0500 Received: from WRJJRS@aol.com by imo-m13.mx.aol.com (mail_out_v39.1.) id q.c1a.4d7e564a (34931) for ; Mon, 5 Jan 2009 17:00:13 -0500 (EST) Received: from smtprly-mb03.mx.aol.com (smtprly-mb03.mx.aol.com [64.12.207.150]) by cia-da04.mx.aol.com (v121_r5.5) with ESMTP id MAILCIADA044-5c6e496282e333d; Mon, 05 Jan 2009 17:00:13 -0500 Received: from WEBMAIL-MB06 (webmail-mb06.webmail.aol.com [64.12.170.154]) by smtprly-mb03.mx.aol.com (v121_r5.5) with ESMTP id MAILSMTPRLYMB034-5c6e496282e333d; Mon, 05 Jan 2009 17:00:03 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: 20B install issues overcome Date: Mon, 05 Jan 2009 17:00:03 -0500 X-AOL-IP: 66.253.96.220 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CB3D981887A192_774_23B1_WEBMAIL-MB06.sysops.aol.com" X-Mailer: AOL Webmail 40627-STANDARD Received: from 66.253.96.220 by WEBMAIL-MB06.sysops.aol.com (64.12.170.154) with HTTP (WebMailUI); Mon, 05 Jan 2009 17:00:03 -0500 Message-Id: <8CB3D981876F11C-774-116D@WEBMAIL-MB06.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CB3D981887A192_774_23B1_WEBMAIL-MB06.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Ernest, Setting up the band gap tubes to flow air thru would be a good idea. Feeding that air into the downstream flow as we were talking about with the cool tube would also be a good way to get the pumping for free. Bill -----Original Message----- From: Ernest Christley To: Rotary motors in aircraft Sent: Mon, 5 Jan 2009 12:23 pm Subject: [FlyRotary] Re: 20B install issues overcome wrjjrs@aol.com wrote:? > Earnest,? > I believe that the SuperTrapp muffler is an example of a band gap > device and it worked well, if properly tuned.? > I think the large block idea has merit too, but you will have to allow > enough thickness to prevent the tubes that see the exhaust first to > fight the harmonic vibration and heat. Different size diamonds in the > exhaust stream might also help fight harmonics.? > Bill Jepson? I haven't given it enough thought to have an actual plan, other than a canister with tubes oriented to allow a flow of cooling air.? ? --? Homepage: http://www.flyrotary.com/? Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html? ----------MB_8CB3D981887A192_774_23B1_WEBMAIL-MB06.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" Ernest,
Setting up the band gap tubes to flow air thru would be a good idea. Feeding that air into the downstream flow as we were talking about with the cool tube would also be a good way to get the pumping for free.
Bill



-----Original Message-----
From: Ernest Christley <echristley@nc.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 5 Jan 2009 12:23 pm
Subject: [FlyRotary] Re: 20B install issues overcome

wrjjrs@aol.com wrote: 
> Earnest, 
> I believe that the SuperTrapp muffler is an example of a band gap > device and it worked well, if properly tuned. 
> I think the large block idea has merit too, but you will have to allow > enough thickness to prevent the tubes that see the exhaust first to > fight the harmonic vibration and heat. Different size diamonds in the > exhaust stream might also help fight harmonics. 
> Bill Jepson 
I haven't given it enough thought to have an actual plan, other than a canister with tubes oriented to allow a flow of cooling air. 
 
-- 
Homepage: http://www.flyrotary.com/ 
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html 
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