Return-Path: Sender: (Marvin Kaye) To: lml Date: Thu, 14 Nov 2002 11:34:43 -0500 Message-ID: X-Original-Return-Path: Received: from mpls-qmqp-01.inet.qwest.net ([63.231.195.112] verified) by logan.com (CommuniGate Pro SMTP 4.0.1) with SMTP id 1870679 for lml@lancaironline.net; Thu, 14 Nov 2002 11:06:39 -0500 Received: (qmail 31677 invoked by uid 0); 14 Nov 2002 16:05:38 -0000 Received: from unknown (63.231.195.9) by mpls-qmqp-01.inet.qwest.net with QMQP; 14 Nov 2002 16:05:38 -0000 Received: from dnvr-dsl-gw20-poold68.dnvr.uswest.net (HELO marauder) (65.100.147.68) by mpls-pop-09.inet.qwest.net with SMTP; 14 Nov 2002 16:06:38 -0000 X-Original-Date: Thu, 14 Nov 2002 09:09:04 -0700 X-Original-Message-ID: <000001c28bf8$27c66960$0300000a@marauder> From: "Mike Hutchins" X-Original-To: "Lancair Mailing List (E-mail)" Reply-To: Subject: Lancair IV Airfoils MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2911.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Mark Steitle, In Martin Hollmann's book "Modern Aircraft Design, Volume 1" he reports that the IV wing root was designed by Rick McWilliams and is designated as a RXM5-217. He notes that this has a favorable pressure gradient in cruise and a larger leading edge radius than typical laminar flow airfoils. The Jones-Joukowski parameters are: Xc=-0.086, Yc=0.030, Xt=1.051, Yt=0.004 and D=0.100. The tip is a NACA 64212 and they performed a linear interpolation between the to airfoil sections from tip to root. Also note that they included 2 degrees of washout at the tip. The Horizontal and Vertical tails are NACA 63015. Unless Lance changde these from when Martin was involved, this data should still be correct. Regards, Mike Hutchins