X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 64 [XX] (50%) RECEIVED: IP not found on home country list (25%) HTML: title tag is empty (25%) BODY: content type is strictly "text/html" Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 21 Mar 2007 11:41:07 -0400 Message-ID: X-Original-Return-Path: Received: from pfepb.post.tele.dk ([195.41.46.236] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1934579 for lml@lancaironline.net; Wed, 21 Mar 2007 10:11:59 -0400 Received-SPF: none receiver=logan.com; client-ip=195.41.46.236; envelope-from=tj@yacht-pool.dk Received: from [192.168.15.100] (cpe.atm2-0-55480.0xc2c09616.kd4nxx16.customer.tele.dk [194.192.150.22]) by pfepb.post.tele.dk (Postfix) with ESMTP id C2A2CA50019 for ; Wed, 21 Mar 2007 15:09:56 +0100 (CET) X-Original-Message-ID: <46013CB5.2010306@yacht-pool.dk> X-Original-Date: Wed, 21 Mar 2007 15:09:57 +0100 From: =?ISO-8859-1?Q?Tim_J=F8rgensen?= Organization: Yacht-Pool Forsikring User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: da, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] Aileron Flutter References: In-Reply-To: Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit "Some LNC2 have been know to have a buz at the ailerons. And yes, this is NOT flutter coz flutter would have ripped your ailerons off your wings and you would have been unable to fix this problem..."

I have to disagree with you on this one, Rick.
The "buzzing" is indeed flutter, only is the amplitude of the flutter limited by a counterweight installed at the end of a spring, consisting of a curved piece of fibreglass.
If, over time, the spring weakens (delaminates), the flutter amplitude changes to the worse, inducing yet stronger forces to the spring, which in turn accelerates further delamination. Once the delamination has progressed to a certain extent, you are going to have a bad day, as the buzzing (slow-destructive flutter) will evolve into a full and immediately catastrophic flutter. It´s the nature of the beast.
In reality, the only thing seperating these two "kinds" of flutter is the strength of your wing skins, ailerons, bonds and hardware.
 
You may name it as you please, call it "non-destructive flutter", "slow-destructive flutter", "rapid aileron movement", "funny humming" or even "buzzing", but flutter it is.

Anyway, it doesn´t take much imagination to see what would happen if an unbalanced aileron started to "buzz"............

So: "Buzzing" is to be taken seriously and the solution seems to be a couple of prime ribs slapped into the spring. I believe there is about a zillion posts and pics on the topic in the archives.

Regards
Tim Jorgensen
360MKIIOBFB  /  65%