Return-Path: Received: from [63.114.235.82] (account ) by logan.com (CommuniGate Pro WebUser 4.0.5) with HTTP id 2002941 for ; Wed, 29 Jan 2003 10:33:05 -0500 From: "Marvin Kaye" Subject: Re: ice To: lml X-Mailer: CommuniGate Pro Web Mailer v.4.0.5 Date: Wed, 29 Jan 2003 10:33:05 -0500 Message-ID: In-Reply-To: <000001c2c7a8$732430e0$55884142@VAIO> MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for "clark baker" : >>Was the position of your elevator normal or did I see a very large amount of nose-down elevator in compensation for the ice? If yes, please tell us more about the handling. Did the wing ice create nose-up pitching? Did the tail ice create greater aerodynamic negative angle of incidence compensated by the added down elevator? Scott Krueger<< Scott, I noticed the large nose-down position of the elevator also (in the picture). Due to the significant negative effects the ice buildup created, we did not feel like exploring the handling envelope. However, I can make several observations: - First, I was shocked at how rapidly the ice accumulated- almost like we went from no ice to noticeable ice. I would equate the size/shape of the ice buildup on the wing to a broomstick handle, cut in half, glued to the leading edge. The ice buildup on the tail appeared moderately greater (which I understand is quite common). The ice formation was much different than another ice encounter (more gradual buildup) that produced a much more uniform coating on the leading edge (which had only a slight negative effect on performance). - The speed/performance decay was quite surprising (at approximately 9k msl). The 45kt loss in speed may have been a slight exaggeration, but the decline was at least +30kts. - The handling/performance felt very sluggish/heavy. We did not notice anything else that unusual, including the large nose-down elevator position. I have the Mark II tail, which has fairly powerful trim capabilities, so we may have unconsciously trimmed that effect away - I do not know how much of the performance loss was due to propeller ice (I have the MT 3 blade), although studies by Cessna show that propeller ice is a noticeable, but NOT substantial, part of the performance loss. I am not an engineer, and am also curious what aerodynamic effect may have been responsible for the unusual elevator position. Regards, Clark Baker N250JF LNC2 360 http://lancair.net/Lists/lml/Message/20225-02-B/P1010022.JPG http://lancair.net/Lists/lml/Message/20225-03-B/P1010021.JPG