Submitted by Anonymous on Tue, 09/08/1998 - 02:12 Forums: LML Archive From: Angier M. Ames <alphadog [at] nii.net> Subject: Flutter and Flap SB Date: Mon, 07 Sep 1998 22:12:41 -0400 To: Lancair <lancair.list [at] olsusa.com> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> This message was originally sent to the LIST on August 24 and I am quite surprised that it did not generate a single response except a personal one to me from Lance Neibauer. Check out the flutter data at Marv's website. So, who are we to believe....Lance Neibauer or Martin Hollmann??? For the safety of my butt and that of my wife, I'll sacrifice a few pounds in the baggage compartment and take Martin's suggestion of placing additional BID on the top and bottom of the fuselage forward of the MKII tail. In Lance's November '97 response to Martin's analysis of the MKII tail, he indicated that a Service Bulletin would be forthcoming quickly concerning flap pre-loading of about 4lbs at the outboard end of each flap. Either I have missed this SB or it was never issued. Could one of you shed some light on this subject? I don't recall any discussion on this thread of the MKII tail flutter controversy...so, any thoughts would be appreciated. Angier Ames Response.... Dear Angier, I read your flutter comment and would like to add a few points. First of all, your concern is of obvious importance as it should be. To that point, please understand that the flutter issue was never between me and Martin. We hired the absolute best flutter expert in the world for this type of composite GA aircraft. He has performed work during the past 20 years for Grob, Extra, Dimona, Pilatus, etc., etc, etc. The testing was far more involved vs. what Martin did. The result was acknowledgement of a flutter free condition with the large tail, (with and without wingtip extensions), up to 350kts. I'm sorry and no disrespect meant to Martin who is trying to learn this type of analysis, but he is in error - which is not the first time by the way. So, based on the freedoms of this experimental category, you certainly are able to add weight to the tail section if it makes you sleep better. By the way, if this were a certified Lancair (Columbia) you would not be allowed to do so. However, if you do make those changes, those possessing the greatest knowledge would tell you that you've merely reduced payload and shifted CG aft - two very undesirable conditions. Food for thought. Sincerely, Lance Post a Reply You must have JavaScript enabled to use this form. Your name Subject Comment * Switch to plain text editorMore information about text formats Text format Filtered HTMLPlain text Filtered HTMLWeb page addresses and e-mail addresses turn into links automatically.Each email address will be obfuscated in a human readable fashion or, if JavaScript is enabled, replaced with a spam resistent clickable link. Email addresses will get the default web form unless specified. If replacement text (a persons name) is required a webform is also required. Separate each part with the "|" pipe symbol. Replace spaces in names with "_".Allowed HTML tags: <a> <em> <strong> <cite> <blockquote> <code> <ul> <ol> <li> <dl> <dt> <dd> <h1> <h2> <h3>Lines and paragraphs break automatically.Plain textNo HTML tags allowed.Each email address will be obfuscated in a human readable fashion or, if JavaScript is enabled, replaced with a spam resistent clickable link. Email addresses will get the default web form unless specified. If replacement text (a persons name) is required a webform is also required. Separate each part with the "|" pipe symbol. Replace spaces in names with "_".Web page addresses and e-mail addresses turn into links automatically.Lines and paragraphs break automatically. Attachments Add a new file Files must be less than 512 MB.Allowed file types: jpg jpeg gif png txt doc docx xls xlsx pdf ppt pptx pps ppsx odt ods odp mp3 mov mp4 m4a m4v mpeg avi ogg oga ogv weba webp webm. Leave this field blank
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