Return-Path: Received: from smtpauth06.mail.atl.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 776016 for flyrotary@lancaironline.net; Tue, 08 Mar 2005 19:14:58 -0500 Received-SPF: neutral receiver=logan.com; client-ip=209.86.89.66; envelope-from=jerryhey@earthlink.net Received: from [65.176.161.122] (helo=earthlink.net) by smtpauth06.mail.atl.earthlink.net with asmtp (Exim 4.34) id 1D8oq3-0006t6-SM for flyrotary@lancaironline.net; Tue, 08 Mar 2005 19:14:12 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=simple; s=test1; d=earthlink.net; h=Date:Subject:Content-Type:Mime-Version:From:To:In-Reply-To:Message-Id:X-Mailer; b=jE4s/nI21LLMbdjVIGQ+/X/wLSVtlydSAF0CH2x2wK3isHGRsiloW1BV1TqEs9PC; Date: Tue, 8 Mar 2005 19:15:21 -0500 Subject: Re: [FlyRotary] Re: Anechoic Muffler Content-Type: multipart/alternative; boundary=Apple-Mail-8-1023619365 Mime-Version: 1.0 (Apple Message framework v552) From: Jerry Hey To: "Rotary motors in aircraft" In-Reply-To: Message-Id: <5386E330-9030-11D9-A9EE-0003931B0C7A@earthlink.net> X-Mailer: Apple Mail (2.552) X-ELNK-Trace: 8104856d7830ec6b1aa676d7e74259b7b3291a7d08dfec796f69638987f14d79be7c99a2ae113c2f350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 65.176.161.122 --Apple-Mail-8-1023619365 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=ISO-8859-1; format=flowed That is what the tangential muffler does or is supposed to do. Can't=20 comment on "anechoic' until I find my dictionary but the basic strategy=20= you have outlined is what we are after. Jerry On Tuesday, March 8, 2005, at 06:58 PM, Tom wrote: > Just to stir things up...=A0=A0=A0=A0 It seems that with exhaust = systems, the=20 > exhaust consists of two parts which should be handled differently.=A0=A0= =A0=20 > Part 1 is the exhaust gas flow which we want to flow out with little=20= > restriction. =A0=A0Part 2=A0is the exhaust pulse which we try to = attenuate,=20 > breakup, etc.=A0=A0=A0=A0=A0These two are like the difference between = wind and=20 > sound-waves.=A0=A0=A0=A0=A0=A0In the past=A024 hours or so,=A0I've = been wondering=20 > about using anechoic chamber principles to attenuate the pulse.=A0=A0=A0= =A0 I=20 > have a specific layout in mind which should tend to=A0attenuate the=20 > pulses while not interfering with exhaust gas flow.=A0=A0=A0=A0 = Anybody hear=20 > of such a thing? > > Tom (looking for project sponsors or a job) > > > > > Celebrate Yahoo!'s 10th Birthday! > Yahoo! Netrospective: 100 Moments of the Web=20= --Apple-Mail-8-1023619365 Content-Transfer-Encoding: quoted-printable Content-Type: text/enriched; charset=ISO-8859-1 That is what the tangential muffler does or is supposed to do. Can't comment on "anechoic' until I find my dictionary but the basic strategy you have outlined is what we are after. Jerry=20 On Tuesday, March 8, 2005, at 06:58 PM, Tom wrote: Just to stir things up...=A0=A0=A0=A0 It seems that with = exhaust systems, the exhaust consists of two parts which should be handled differently.=A0=A0=A0 Part 1 is the exhaust gas flow which we want to = flow out with little restriction. =A0=A0Part 2=A0is the exhaust pulse which = we try to attenuate, breakup, etc.=A0=A0=A0=A0=A0These two are like the = difference between wind and sound-waves.=A0=A0=A0=A0=A0=A0In the past=A024 hours or = so,=A0I've been wondering about using anechoic chamber principles to attenuate the pulse.=A0=A0=A0 =A0 I have a specific layout in mind which should = tend to=A0attenuate the pulses while not interfering with exhaust gas flow.=A0=A0=A0=A0 Anybody hear of such a thing? Tom (looking for project sponsors or a job) < Celebrate Yahoo!'s 10th Birthday! 1999,1999,FFFFYahoo! Netrospective: 100 Moments of the Web = --Apple-Mail-8-1023619365--