X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 31 Mar 2011 12:43:57 -0400 Message-ID: X-Original-Return-Path: Received: from ndmsnpf02.ndc.nasa.gov ([198.117.0.122] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4928134 for lml@lancaironline.net; Thu, 31 Mar 2011 11:50:30 -0400 Received-SPF: none receiver=logan.com; client-ip=198.117.0.122; envelope-from=michael.s.reinath@nasa.gov Received: from ndjsppt02.ndc.nasa.gov (ndjsppt02.ndc.nasa.gov [198.117.1.101]) by ndmsnpf02.ndc.nasa.gov (Postfix) with ESMTP id 2F7BE10834A for ; Thu, 31 Mar 2011 10:49:53 -0500 (CDT) Received: from ndjshub04.ndc.nasa.gov (ndjshub04-pub.ndc.nasa.gov [198.117.1.34]) by ndjsppt02.ndc.nasa.gov (8.14.4/8.14.4) with ESMTP id p2VFnr3h013517 for ; Thu, 31 Mar 2011 10:49:53 -0500 Received: from NDJSSCC06.ndc.nasa.gov ([198.117.4.176]) by ndjshub04.ndc.nasa.gov ([10.202.202.163]) with mapi; Thu, 31 Mar 2011 10:49:52 -0500 From: "Reinath, Michael S. (ARC-AM)" X-Original-To: Lancair Mailing List X-Original-Date: Thu, 31 Mar 2011 10:49:51 -0500 Subject: [LML] Re: Finishing Elevator Question Thread-Topic: [LML] Re: Finishing Elevator Question Thread-Index: Acvvu0VAjyg0EFcby0qR0pe4vfIW9Q== X-Original-Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-Entourage/13.6.0.100712 acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.2.15,1.0.148,0.0.0000 definitions=2011-03-31_07:2011-03-31,2011-03-31,1970-01-01 signatures=0 Take a look in Abbott and Doenhoff, "Theory of Wing Sections". There are plenty of airfoils with concave shape for the aft 25% of the section, especially the symmetrical ones. It's the airfoil shape. If you fill it in, you are changing the airfoil shape and no longer have the design airfoil. Mike Reinath LNC2 MKII @ 1050 hrs