Return-Path: <marv@lancaironline.net> Sender: "Marvin Kaye" <marv@lancaironline.net> To: lml@lancaironline.net Date: Wed, 27 Oct 2004 13:58:51 -0400 Message-ID: <redirect-488520@logan.com> X-Original-Return-Path: <Christopher.Zavatson@udlp.com> Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 488531 for lml@lancaironline.net; Wed, 27 Oct 2004 13:50:15 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.109.1.8; envelope-from=Christopher.Zavatson@udlp.com Received: from asdmngwia.mpls.udlp.com (asdmngwia.mpls.udlp.com [10.1.62.22]) by mta-out-1.udlp.com (8.12.10/8.12.10) with ESMTP id i9RFubu2012135 for <lml@lancaironline.net>; Wed, 27 Oct 2004 10:56:37 -0500 Received: from DM-MN-06-MTA by asdmngwia.mpls.udlp.com with Novell_GroupWise; Wed, 27 Oct 2004 12:48:36 -0500 X-Original-Message-Id: <s17f9924.049@asdmngwia.mpls.udlp.com> X-Mailer: Novell GroupWise Internet Agent 6.0.2 X-Original-Date: Wed, 27 Oct 2004 12:48:17 -0500 From: "Christopher Zavatson" <Christopher.Zavatson@udlp.com> X-Original-To: <lml@lancaironline.net> Subject: Re: [LML] Tuft testing Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Guinevere: 2.0.15 ; United Defense LP Scotty, You might want to try tufting the bottom rear half of the wing. This can be an area of separation on NLF airfoils at low AOA (high speed). It is just a little harder to film the results. Chris Zavatson >>> WarbirdAeroPress@cox.net 10/27/04 08:21AM >>> Hi gang, Well, being a future air racer, I thought I would be a good experimenter and find out how the airflow acted over the top of my wing at different airspeeds. I dutifully tufted a section of the top left wing with cotton tufts and launched with a video camera. Boy, was I disappointed! I thought I would see some detached flow as airspeed increased. I went up to 260 mph indicated and *nothing.* The flow never become detached along the length of the tufts chordwise. So much for placing turbulator tape for some extra speed, huh? Well, I might be missing something, so I thought I would include a photo and see if you guys had any input. I plan on doing it again with tufting near the wing root and maybe another section at the tip. Just FYI, I had to slow to about 100 mph, bank over and approach an accelerated stall to see any effect on the tufts... Only the last two rows showed any disturbed airflow. Even at 100 mph indicated and full flaps, all of the tufts were smooth and undisturbed. Scotty G Dago Red Unlimited Air Race Team Unleashed Sport Class Air Race Team WarbirdAeroPress.com All mail is scanned for viruses.