Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sat, 06 Dec 2003 13:26:23 -0500 Message-ID: X-Original-Return-Path: Received: from mail.vineyard.net ([204.17.195.90] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2840054 for lml@lancaironline.net; Sat, 06 Dec 2003 12:34:28 -0500 Received: from localhost (loopback [127.0.0.1]) by mail.vineyard.net (Postfix) with ESMTP id A764292364; Sat, 6 Dec 2003 12:26:06 -0500 (EST) Received: from mail.vineyard.net ([127.0.0.1]) by localhost (king1.vineyard.net [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 84933-07; Sat, 6 Dec 2003 12:26:06 -0500 (EST) Received: from direct (fsy35.vineyard.net [66.101.65.35]) by mail.vineyard.net (Postfix) with SMTP id 91FE692339; Sat, 6 Dec 2003 12:26:05 -0500 (EST) X-Original-Message-ID: <005201c3bc1e$594a7b00$23416542@direct> From: "Ted Stanley" X-Original-To: "Mail List Lancair" X-Original-Cc: Subject: Re: Blunt T/E X-Original-Date: Sat, 6 Dec 2003 07:44:22 -0500 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 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Virus-Scanned: by AMaViS at Vineyard.NET Below is an explanation of "aileron snatch" taken from Flight Standards Information Bulletin for Air Transportation (FSAT) # 97-03 - In-flight Icing Operations and Training Recommendations. Ted Stanley How can ice affect roll attitude? Ice can contribute to partial or total wing stall followed by roll, aileron snatch, or reduced aileron effectiveness. Aileron "snatch" is a descriptive term that results from an imbalance in the sum of the product of aerodynamic forces at an AOA that may be less than wing stall, that tends to deflect the aileron away from the neutral position. On unpowered controls, it is felt as a change in control wheel force. Instead of requiring force to deflect the aileron, it requires force to return the aileron to the neutral position. All else equal, smaller ailerons would have smaller snatch forces. Aileron instability sensed as an oscillation, vibration or buffet in the control wheel is another tactile cue that the flow field over the ailerons is disturbed.