X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 12 May 2007 10:02:49 -0400 Message-ID: X-Original-Return-Path: Received: from mtao04.charter.net ([209.225.8.178] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2039705 for lml@lancaironline.net; Sat, 12 May 2007 09:35:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.225.8.178; envelope-from=GAMarr@Charter.Net Received: from aa08.charter.net ([10.20.200.160]) by mtao04.charter.net (InterMail vM.7.08.02.00 201-2186-121-20061213) with ESMTP id <20070512133433.VHBG1527.mtao04.charter.net@aa08.charter.net>; Sat, 12 May 2007 09:34:33 -0400 Received: from DB77R351 ([71.14.140.156]) by aa08.charter.net with ESMTP id <20070512133433.KVYB27101.aa08.charter.net@DB77R351>; Sat, 12 May 2007 09:34:33 -0400 From: "Giffen Marr" X-Original-To: "'Bryan Wullner'" , References: Subject: RE: Flight Characteristic Question X-Original-Date: Sat, 12 May 2007 08:34:32 -0500 X-Original-Message-ID: <009401c7949a$463a9fb0$6401a8c0@DB77R351> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 Thread-Index: AceUlUeB/qUcSfvnQ9qrkuoJhzDzzgAAxFCg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 In-Reply-To: X-Chzlrs: 0 The negative incidence is designed into the aircraft for nominal cg loading. If your CG moves aft, then the amount of download needed to be produced by the elevator is decreased which means you will need to adjust your trim. From a pilot standpoint, the further aft you move the cg, the less speed stability you will have. As the cg moves forward, from the pilots point of view, speed stability improves, but you will run out of nose up trim at slow speeds, which means you may run out of aft stick on landing. What you would like is for nominal cg loading, the horizontal stabilizer and the elevator to be streamlined at cruise to obtain minimal drag. Giff Marr LIV-P/ Mistral 65% -----Original Message----- From: Bryan Wullner [mailto:sbej@verizon.net] Sent: Friday, May 11, 2007 8:51 PM To: lml@lancaironline.net Subject: Flight Characteristic Question I am building a Lancair 360. I just permanently bonded the Horizontal stab on. I took every precaution to get it within the 1/2 to 1 degree of negative incidence that Lancair specifies. I used the water level to come come up with the proper incidence based on the plans. After cure I recheck my incidence and Im 99% sure I have somewhere between .09 and 1.3 degree of negative incidence My question is: If the Horizontal has more than 1 degree of Negative incidence, say 1.5 or higher, how does that affect the flight characteristics? And vice versa if it doesn't have enough negative incidence what does that do to the flight? Thanks Bryan