Return-Path: Sender: (Marvin Kaye) To: lml Date: Sat, 13 Sep 2003 12:13:54 -0400 Message-ID: X-Original-Return-Path: Received: from ms-smtp-02.tampabay.rr.com ([65.32.1.39] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2578214 for lml@lancaironline.net; Sat, 13 Sep 2003 11:45:02 -0400 Received: from tednoel (220.198.8.67.cfl.rr.com [67.8.198.220]) by ms-smtp-02.tampabay.rr.com (8.12.5/8.12.5) with SMTP id h8DFj1hB006061 for ; Sat, 13 Sep 2003 11:45:02 -0400 (EDT) X-Original-Message-ID: <009f01c37a0e$03a26110$0100000a@tednoel> From: "Ted Noel" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Gross Weight & Balance of IV-P X-Original-Date: Sat, 13 Sep 2003 11:45:10 -0400 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 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Joe Rodriguez wrote: > To add my 2 cents worth. You guys with the high gross weights better be > real careful with turbulent air penetration speeds To the best of my > knowledge, no one has recalculated this number for these high gross weights. > Ps. I would really like to know how someone can get this much weight into a > IV and not be aft CG. Scares me. It seems that the CG issue is far more important. Maneuvering speed, abbreviated Va, is called the rough air speed. It is defined as the maximum speed at which full abrupt control deflection can be made without exceeding the design load factor...Maneuvering speed is a value of 1.9 Vs. It changes with a change in gross weight; decreasing as the weight decreases (http://www.mountainflying.com/fly-low3.htm). That is, as weight goes up, stall speed and maneuvering speed go up with it. Therefore, you can penetrate turbulence at higher speed when heavy than when light. On the other hand, keeping the CG within proper bounds greatly affects controllability. Forward CG may make controlled landing difficult or impossible, while aft CG may make control impossible in any flight regime. Ted Noel