X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([204.127.217.103] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2788864 for flyrotary@lancaironline.net; Wed, 12 Mar 2008 15:59:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=204.127.217.103; envelope-from=ceengland@bellsouth.net Received: from [192.168.10.6] (adsl-152-72-88.jan.bellsouth.net[70.152.72.88]) by isp.att.net (frfwmhc03) with ESMTP id <20080312195910H0300i2ecie>; Wed, 12 Mar 2008 19:59:10 +0000 X-Originating-IP: [70.152.72.88] Message-ID: <47D8360F.30508@bellsouth.net> Date: Wed, 12 Mar 2008 14:59:11 -0500 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) Gecko/20080201 SeaMonkey/1.1.8 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Emailing: Inclinded Radiators.doc References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Ed Anderson wrote: > Here is an extract out of an article on race car cooling that is very > interesting about use of inclined radiators. Unfortunately, I could > not find any reference as to where this information was derived from - > but, if correct, is fairly significant. > > It basically states that inclining a radiator from 0 deg to 20-30 deg > will decrease cooling and increase drag - not terribly surprising, > however, the article continues saying that at approx. 55 dig of > inclination the cooling effectiveness is 30% greater than a radiator > with no inclination and the drag is 20% less!!! Now I found that > surprising - but, then air flow does take surprising twists (no pun > intended). > > While I find that claim very interesting - I have not found any > collaborating documents. But, thought the group might find it interesting > > For your information > > Ed I learned a long time ago (Maybe it was Mr. Wizard & blocks sliding down a ramp...??) that with physics, what looks right or sounds right probably isn't. But this one looks like a trick question. Notice the mention of 'larger radiator'? Perhaps the original inlet vs. core density wasn't set up correctly & they were trying to force too much air through the core. When they tilted the radiator, they apparently also made it bigger, meaning more fin area *and* more open area for the same inlet/outlet areas. But like I said, what sounds right, rarely is, if it's me doing the listening... Charlie