X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1036924 for flyrotary@lancaironline.net; Thu, 16 Mar 2006 22:40:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.73; envelope-from=ceengland@bellsouth.net Received: from ibm69aec.bellsouth.net ([209.215.60.82]) by imf25aec.mail.bellsouth.net with ESMTP id <20060317033953.PSIF20420.imf25aec.mail.bellsouth.net@ibm69aec.bellsouth.net> for ; Thu, 16 Mar 2006 22:39:53 -0500 Received: from [127.0.0.1] (really [209.215.60.82]) by ibm69aec.bellsouth.net with ESMTP id <20060317033952.FWNU25599.ibm69aec.bellsouth.net@[127.0.0.1]> for ; Thu, 16 Mar 2006 22:39:52 -0500 Message-ID: <441A2F81.10900@bellsouth.net> Date: Thu, 16 Mar 2006 21:39:45 -0600 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: finding a radiator References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit the mallorys wrote: > Ed, > > I did some plotting, and here is what I came up with: > The red line is a straight sided square duct, > Light blue is the exponential Horn duct square, > Brown is the streamline duct square. > > I don't know if the exponential horn differs enough from a straight > line to make a difference. > > Chris In a former life, I built exponential horn loudspeakers for concert sound systems. The rate of expansion was much greater than what's shown on the graph. Perhaps the loading of the heat exchanger alters the formula, but at first glance, something doesn't look right. Charlie