Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Fri, 01 Oct 2004 13:26:34 -0400 Message-ID: X-Original-Return-Path: Received: from mail-relay-3.tiscali.it ([213.205.33.43] verified) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 439530 for lml@lancaironline.net; Fri, 01 Oct 2004 12:15:08 -0400 Received-SPF: none receiver=logan.com; client-ip=213.205.33.43; envelope-from=robert.overmars@tiscali.it Received: from trottolino (62.11.15.249) by mail-relay-3.tiscali.it (7.1.021.3) id 415ACA35000CA753 for lml@lancaironline.net; Fri, 1 Oct 2004 18:14:38 +0200 X-Original-Message-ID: <008f01c4a7d2$8f2edb80$f90f0b3e@interbusiness.it> From: "Robert Overmars" X-Original-To: "Lancair Mailing List" Subject: Fw: [LML] wing incidence indifference X-Original-Date: Fri, 1 Oct 2004 18:20:23 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 From: "terrence o'neill" Subject: Re: [LML] wing incidence indifference > Also, are you assuming the relative wind at the tip and the root are the > same as at MAC, and not affected by planform, etc.? > If the subject is unintentional stalls -- resulting from gusts -- and > inferring that the incidence difference might result in a spin, should we > consider also the other characteristics of the configuration, such as CG, > horizontal tail volume and its own AOA, cleanness of airflow over the > vertical tail, and the direction of the airflow across or UP the rudder? > T saluto T, The relative wind is the sum of, the vector of the gust and the forward velocity of the aeroplane, and the angle of the respective chord line to the free stream velocity. With the correct wing washout of 2 degrees the wing root works at a higher AoA to the relative wind than the tip and is intended to stall first, the stall developing symmetrically and extending symmetrically to the wing tips with increasing AoA. Planform, CG, horizontal tail volume and AoA etc are characteristics which affect the aeroplane's response to the gust. If you want to get really technical , AoA affects upwash, so does use of aileron, and lets not forget Reynold's numbers....etc. Incidence and washout difference between the wings can result in asymmetric lift with powerful forces as I hope I illustrated. ciao, Roberto d'Italia.