X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4080056 for flyrotary@lancaironline.net; Tue, 12 Jan 2010 12:22:24 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.0 c=1 a=ayC55rCoAAAA:8 a=arxwEM4EAAAA:8 a=QdXCYpuVAAAA:8 a=7g1VtSJxAAAA:8 a=ekHE3smAAAAA:20 a=UretUmmEAAAA:8 a=Ia-xEzejAAAA:8 a=kviXuzpPAAAA:8 a=nUuTZ29dAAAA:8 a=itUmdZsYgNE5jzRMjWoA:9 a=WlokOb7cJ3Lgedd2FpcA:7 a=3_nageseUr1_yKuG2Wo9NKRJC0kA:4 a=1vhyWl4Y8LcA:10 a=EzXvWhQp4_cA:10 a=4vB-4DCPJfMA:10 a=LBNyS8sEBlCUEO7V:21 a=RLpnTUC0jCs042FG:21 X-Cloudmark-Score: 0 X-Originating-IP: 75.191.186.236 Received: from [75.191.186.236] ([75.191.186.236:1086] helo=computername) by cdptpa-oedge01.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id 6C/CA-19578-CAFAC4B4; Tue, 12 Jan 2010 17:21:48 +0000 From: "Ed Anderson" Message-ID: <6C.CA.19578.CAFAC4B4@cdptpa-omtalb.mail.rr.com> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Scoops Date: Tue, 12 Jan 2010 12:21:57 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.5510 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Thread-Index: AcqTp7dxA5kAJOX8TdK6OP9ck4MWDwAAuwhg Sort of depends what you consider an air foil, Tony. Wish there were simply answers to you question, but the fact is that any cooling system is the total sum of the performance of ALL the elements in the system. Air flow is one of the important factors. Whenever you want to minimize drag and maximize use of the subsonic air flow, smooth rounded surfaces for the air to flow over generally is desired. Sharp, abrupt changes to surface or cross sectional area generally impede the desire results. So to answer your question, it is generally desirable to have a smooth rounded (air foil?) shape to the duct inlet to reduce turbulence and boundary layer separation. However, that is just a good start, many more factors to consider. Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of tonyslongez@cox.net Sent: Tuesday, January 12, 2010 11:52 AM To: Rotary motors in aircraft Subject: [FlyRotary] Scoops can anyone shed some light? Is there an airfoil that makes up the scoop? and if so can we use different airfoils to get the desired cooling results say in a climb or unusual attitude. In other words can you stall the air going into the scoop. Or am I way off base here? __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com