Return-Path: Received: from mail.theofficenet.com ([65.166.240.5] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with SMTP id 776020 for flyrotary@lancaironline.net; Tue, 08 Mar 2005 19:11:18 -0500 Received-SPF: none receiver=logan.com; client-ip=65.166.240.5; envelope-from=jackoford@theofficenet.com Received: (qmail 14124 invoked from network); 8 Mar 2005 23:56:10 -0000 Received: from dpc691941229.direcpc.com (HELO jack) (69.19.41.229) by mail.theofficenet.com with SMTP; 8 Mar 2005 23:56:10 -0000 Message-ID: <007901c5243c$43b6d360$0200a8c0@jack> From: "Jack Ford" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Anechoic Muffler Date: Tue, 8 Mar 2005 16:09:23 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0076_01C523F9.318A8E40" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_0076_01C523F9.318A8E40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks, Gene tells me you have a picture of the Paternal Grandparents. Oldwhatsmyname ----- Original Message -----=20 From: Tom=20 To: Rotary motors in aircraft=20 Sent: Tuesday, March 08, 2005 3:58 PM Subject: [FlyRotary] Re: Anechoic Muffler Just to stir things up... It seems that with exhaust systems, = the exhaust consists of two parts which should be handled differently. = Part 1 is the exhaust gas flow which we want to flow out with little = restriction. Part 2 is the exhaust pulse which we try to attenuate, = breakup, etc. These two are like the difference between wind and = sound-waves. In the past 24 hours or so, I've been wondering about = using anechoic chamber principles to attenuate the pulse. I have a = specific layout in mind which should tend to attenuate the pulses while = not interfering with exhaust gas flow. Anybody hear of such a thing? Tom (looking for project sponsors or a job) -------------------------------------------------------------------------= ----- Celebrate Yahoo!'s 10th Birthday!=20 Yahoo! Netrospective: 100 Moments of the Web ------=_NextPart_000_0076_01C523F9.318A8E40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Thanks,

Gene tells me you have a picture of the = Paternal=20 Grandparents.

Oldwhatsmyname

----- Original Message -----

From:=20 Tom

To: Rotary motors in = aircraft

Sent: Tuesday, March 08, 2005 = 3:58=20 PM

Subject: [FlyRotary] Re: = Anechoic=20 Muffler

Just to stir things up... It seems that = with=20 exhaust systems, the exhaust consists of two parts which should be = handled=20 differently. Part 1 is the exhaust gas flow which = we want=20 to flow out with little restriction. Part 2 is the = exhaust=20 pulse which we try to attenuate, breakup,=20 etc. These two are like the difference = between=20 wind and sound-waves. In the = past 24=20 hours or so, I've been wondering about using anechoic chamber=20 principles to attenuate the pulse. I have a = specific layout in mind which should tend to attenuate the = pulses while=20 not interfering with exhaust gas flow. = Anybody hear=20 of such a thing?

Tom (looking for project sponsors or a = job)

Celebrate Yahoo!'s 10th Birthday!
Yahoo! = Netrospective: 100=20 Moments of the Web ------=_NextPart_000_0076_01C523F9.318A8E40--