Return-Path: Received: from [65.54.168.123] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 777237 for flyrotary@lancaironline.net; Wed, 09 Mar 2005 16:01:11 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.168.123; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 9 Mar 2005 13:00:25 -0800 Message-ID: Received: from 4.171.174.197 by BAY3-DAV19.phx.gbl with DAV; Wed, 09 Mar 2005 21:00:25 +0000 X-Originating-IP: [4.171.174.197] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Different Tangential Mufflers Date: Wed, 9 Mar 2005 16:00:21 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0131_01C524C1.19036C70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Wed, 9 Mar 2005 16:00:21 -0500 X-OriginalArrivalTime: 09 Mar 2005 21:00:25.0474 (UTC) FILETIME=[041B4E20:01C524EB] This is a multi-part message in MIME format. ------=_NextPart_000_0131_01C524C1.19036C70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I may not be understanding what the 2 rotor version (cool pipe going all = the way through) is supposed to accomplish or maybe my gut-feel = thermodynamic instincts are way off. I can't imagine this would have = any significant effect on exhaust temps, muffler wall temp or sound. =20 Tracy (been wrong more than once) Bill, from the picture you sent, it isn't clear to me where the 'cool = tube' ends inside the muffler. Give me a clue! Tracy Tracy, On the small muffler (2 rotor) the cool tube goes all the way = thru. The front of the tube needs a feed from the cowl. The exit needs a = pipe to the cowl exit although it could be very thin. This is a sealed = style like Jerry Hey and Ed Klepis have come up with. On the 3 rotor = pipe the cool tube stops just inside the tailpipe. The section might be = a little confusing as it shows a small support bar that was suggested to = prevent the internal pipe from sagging. The sections I included should = give a good indication. The intent is to form a annulus that should draw = air through the tube venturi style. This needs only some clear space in = front of the muffler. The idea is that you should mix air in the = tailpipe to A; cool the exhaust and not burn the paint off the belly, = and B; lessen the exhaust note by absorbing some of the exhaust energy = by mixing cooler air with the exhaust. Bill Jepson ------=_NextPart_000_0131_01C524C1.19036C70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I may not be understanding what the 2 rotor version (cool pipe = going all=20 the way through) is supposed to accomplish or maybe my gut-feel = thermodynamic=20 instincts are way off. I can't imagine this would have any = significant=20 effect on exhaust temps, muffler wall temp or sound.

Tracy (been wrong more than once)

Bill,=20 from the picture you sent, it isn't clear to me where the 'cool tube' = ends=20 inside the muffler. Give me a clue!

Tracy

Tracy, On the small muffler (2 rotor) the cool tube goes all the = way=20 thru. The front of the tube needs a feed from the cowl. The exit = needs a=20 pipe to the cowl exit although it could be very thin. This = is a=20 sealed style like Jerry Hey and Ed Klepis have come up with. On the 3 = rotor=20 pipe the cool tube stops just inside the tailpipe. The section might = be a=20 little confusing as it shows a small support bar that was suggested to = prevent=20 the internal pipe from sagging. The sections I included should give a = good=20 indication. The intent is to form a annulus that should draw air = through the=20 tube venturi style. This needs only some clear space in front of the = muffler.=20 The idea is that you should mix air in the tailpipe to A; cool the = exhaust and=20 not burn the paint off the belly, and B; lessen the exhaust note by = absorbing=20 some of the exhaust energy by mixing cooler air with the = exhaust.

Bill Jepson

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