X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 940613 for flyrotary@lancaironline.net; Wed, 11 May 2005 19:20:14 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-189-178.carolina.res.rr.com [24.74.189.178]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j4BNJQLw012380 for ; Wed, 11 May 2005 19:19:27 -0400 (EDT) Message-ID: <000301c5567f$e59e4f80$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] More about Mufflers Date: Wed, 11 May 2005 19:19:35 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine Hey, Bill! Great find. Boy talk about a thorough investigation. Will take a bit to digest even a part of it, but it looks hopeful that their may be something I can use to quite this louder engine. Ed ----- Original Message ----- From: "Bill Dube" To: "Rotary motors in aircraft" Sent: Wednesday, May 11, 2005 2:36 PM Subject: [FlyRotary] More about Mufflers > For those that are interested in how to design a muffler: > > http://naca.larc.nasa.gov/reports/1954/naca-report-1192/ > > This is very well-written paper and a thorough treatment for > resonance type mufflers. They built 74 different mufflers and compared the > measured sound attenuation with the theoretical attenuation. A lot of good > information. > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html