X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [76.190.204.56] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WEBUSER 5.2.2) with HTTP id 2872658 for lml@lancaironline.net; Sat, 26 Apr 2008 01:05:59 -0400 From: marv@lancair.net Subject: Re: [LML] Re: Window Strength To: lml X-Mailer: CommuniGate Pro WebUser v5.2.2 Date: Sat, 26 Apr 2008 01:05:59 -0400 Message-ID: In-Reply-To: <113242.13833.qm@web62511.mail.re1.yahoo.com> References: <113242.13833.qm@web62511.mail.re1.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1;format="flowed" Content-Transfer-Encoding: 8bit Posted for Charlie Kohler : I agree with Terrence and Brent, I had several days with Martin Holman inspecting an airplane, and we discussed the holes added to the IV fuselage for A/C. I suggested that adding reinforcement should take care of this problem, and he disagreed. He said nearly the same thing Brent said,  Holes---"will have an effect on the torsional stiffness of the fuselage. This, in turn, effects the natural frequency of the empennage. Making the fuselage less stiff by decoupling the window (holes)  reduces the empennage flutter margin."      Charlie K. See me on the Web at  www.Lancair-IV.com