X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.222] (HELO defout.telus.net) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2789928 for flyrotary@lancaironline.net; Thu, 13 Mar 2008 09:35:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.222; envelope-from=tomk@telus.net Received: from priv-edtnaa04.telusplanet.net ([207.216.205.78]) by priv-edtnes29.telusplanet.net (InterMail vM.7.08.02.02 201-2186-121-104-20070414) with ESMTP id <20080313133447.PBSC1757.priv-edtnes29.telusplanet.net@priv-edtnaa04.telusplanet.net> for ; Thu, 13 Mar 2008 07:34:47 -0600 Received: from familygr7vkfo2 (d207-216-205-78.bchsia.telus.net [207.216.205.78]) by priv-edtnaa04.telusplanet.net (BorderWare MXtreme Infinity Mail Firewall) with SMTP id EDVB50CHN2 for ; Thu, 13 Mar 2008 07:35:17 -0600 (MDT) Message-ID: <00a101c8850f$1570d960$6401a8c0@familygr7vkfo2> From: "Tom-Lynn Koftinoff" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Emailing: Inclinded Radiators.doc Date: Thu, 13 Mar 2008 06:35:20 -0700 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 Do "Boundary Layers" have anything to do with the cooling effect: http://en.wikipedia.org/wiki/Boundary_layer http://en.wikipedia.org/wiki/Wind_chill ??? Sort of like blowing across a teaspoon of hot soup, when the boundary layer is removed the soup gets cooler faster. Just a wild guess. Tom ----- Original Message ----- From: "Charlie England" To: "Rotary motors in aircraft" Sent: Wednesday, March 12, 2008 12:59 PM Subject: [FlyRotary] Re: Emailing: Inclinded Radiators.doc > > 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 > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html