X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mxsf30.cluster1.charter.net ([209.225.28.230] verified) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 1030652 for flyrotary@lancaironline.net; Mon, 04 Jul 2005 00:33:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.225.28.230; envelope-from=dalemahan@charter.net Received: from mxip13a.cluster1.charter.net (mxip13a.cluster1.charter.net [209.225.28.143]) by mxsf30.cluster1.charter.net (8.12.11/8.12.11) with ESMTP id j644WghR027663 for ; Mon, 4 Jul 2005 00:32:43 -0400 Received: from fl3-24.217.241.112.charter-stl.com (HELO [192.168.2.2]) (24.217.241.112) by mxip13a.cluster1.charter.net with ESMTP; 04 Jul 2005 00:32:43 -0400 X-IronPort-AV: i="3.93,254,1115006400"; d="scan'208"; a="1241666313:sNHT18591572" Message-ID: <42C8BB18.3040201@charter.net> Date: Sun, 03 Jul 2005 23:29:12 -0500 From: Dale Mahan User-Agent: Mozilla Thunderbird 0.7.3 (Windows/20040803) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Muffler References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Square or round will work. Drawings: http://www.rotaryeng.net/exhaust.html Somehow I get the idea that square is quieter. Dale Charlie England wrote: > Bulent Aliev wrote: > >> I believe if the whole thing was made by using square, or out of >> round pipes and shapes it will reduce the noise better. >> Maybe that’s why there is no square brass musing instruments? Their >> horns are all round to amplify the sound. >> Buly > > > You're probably right, but the chance of breaking something goes up > significantly if it isn't round. The flat sides will flex & encourage > fatigue cracking if it isn't reinforced a lot (heavier). > > Charlie > > > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html >> >