X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 28 Nov 2011 16:51:14 -0500 Message-ID: X-Original-Return-Path: Received: from nm10.bullet.mail.sp2.yahoo.com ([98.139.91.80] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with SMTP id 5262481 for lml@lancaironline.net; Mon, 28 Nov 2011 16:08:11 -0500 Received-SPF: none receiver=logan.com; client-ip=98.139.91.80; envelope-from=charliekohler@yahoo.com Received: from [98.139.91.70] by nm10.bullet.mail.sp2.yahoo.com with NNFMP; 28 Nov 2011 21:07:37 -0000 Received: from [98.139.91.5] by tm10.bullet.mail.sp2.yahoo.com with NNFMP; 28 Nov 2011 21:07:37 -0000 Received: from [127.0.0.1] by omp1005.mail.sp2.yahoo.com with NNFMP; 28 Nov 2011 21:07:37 -0000 X-Yahoo-Newman-Id: 940166.19818.bm@omp1005.mail.sp2.yahoo.com Received: (qmail 75270 invoked from network); 28 Nov 2011 21:07:36 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:References:In-Reply-To:X-Apple-Yahoo-Original-Message-Folder:Mime-Version:Content-Type:Content-Transfer-Encoding:Message-Id:X-Mailer:From:X-Apple-Yahoo-Replied-Msgid:Subject:Date:To; b=afiIe8dhtf0IA4rr7bMKIh+dzyFPL3jnvYwqVHLN3Fh3qPyNParadJ7v0ZGzfemnHr55qdn848igOOnerYdZVFGcwl1dbT1LX7EWMqYAHaVTX/CLSwSXd1zhXpJY+fvVFuyfYJo78uFhiK7O3SIhn4Bz5p6VpktVwwQsbJnr3TY= ; X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: tCjJqMIVM1mlFV9bJqCO1wYQG.rEYg0n9KaMNUvLf1GDq59 co76OY3ATetWedn4VI2xnF0nSHksCO4gPzxy.3ha3T64gEKlVjbJGV4c4hRG BcU4_xs84gulq5WXIkfYMCr136o9yjFrfSYVO4TSN8Q_U8xcgJwoSi0yEf6p dvYbBxcN2A.c6_BmcB59AkKZHOANEL3IXXNJ6MQAj.3nRgEmAKpWOXH9bJBv 4X8LykoeEkJyZIv3M3c73W.QCKzmRUgakt3.1XIvw3dtEw8psvT.z8QXbf.e Ij1b1Kildr1tgOmSRAn5vnggrP4X93F6oGlbJqCPm2FGxA_rMosrM_1H9wdR eJsv0qkJSm7lHSL3Xc7A7ttB.j3rheK25AKLe9bjAhVLkSjppnxxJPxndb.q pri4JHTR5EEuGlpcXL0B7Vbk72eLw5HUUi9DYnTVtYrMHuLgKSEHkpgWL7B0 rREl_xL_rLh259O.A5HozQCNjjXZMDpTzKBLa9NHqfgq3pd2MalE8uWSrChM 0zzNjrkb7tzokgV2ckkHT0KJlItx5Kt519OBQkjSy0z4rPfRlswljze8DeM2 HFzqVKtQEo6qH.lNvvNn67K2ZziJRhtYOJYVCNB_da2e9_9oDzwGfU.j1C63 k5bOsiiBvQDW6ZugW0MA46xjOmKKs8oYQnH2X X-Yahoo-SMTP: VqbMfI2swBDxEnmGxQ5hbLMklMehyCeMuv0- Received: from [192.168.1.9] (charliekohler@67.8.20.136 with xymcookie) by smtp102-mob.biz.mail.gq1.yahoo.com with SMTP; 28 Nov 2011 13:07:35 -0800 PST References: In-Reply-To: X-Apple-Yahoo-Original-Message-Folder: Inbox Mime-Version: 1.0 (iPad Mail 8H8) Content-Type: multipart/alternative; boundary=Apple-Mail-3-609872118 Content-Transfer-Encoding: 7bit X-Original-Message-Id: <439B5630-712A-4F32-AF0C-2A00C0DD708B@yahoo.com> X-Mailer: iPad Mail (8H8) From: Charlie Kohler X-Apple-Yahoo-Replied-Msgid: 1_3553256_ANzjimIAALYNTtOuzAFN0VjpNJ0 Subject: Re: [LML] Re: Legacy vibrations resolved X-Original-Date: Mon, 28 Nov 2011 16:07:33 -0500 X-Original-To: Lancair Mailing List --Apple-Mail-3-609872118 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Your pictures apply to CONTROL surfaces also! Charlie K. See me on the web =20 www.Lancair-IV.com Sent from my iPad On Nov 28, 2011, at 10:52 AM, Chris Zavatson wrot= e: > There was another item observed during the trim tab examination that deser= ves mentioning. I have seen this on other Lancairs as well. The concept re= ally applies to any hinged control surface.=20 > Wherever flow transitions from one flying surface to another, i.e. wing to= aileron or flap, horizontal stab to elevator, or elevator to tab, care must= be taken to ensure the trailing surface is in line with or slightly protrud= es into the slip stream. (see sketch) Flow readily separates if the in-trai= l surface is not in proper alignment. Best case is one merely suffers a dra= g penalty. Worst case is the effectiveness of the surface is compromised. M= any control surface designs will intentional project the leading edge into t= he slipstream during control surface deflection to assure flow remains attac= hed. In the case of the the trim tab, the separated flow served as an excit= ation on the loose tab. This, in turn, got the elevator oscillating which w= as felt in the control stick.=20 > =20 > Chris Zavatson > N91CZ > 360 std > www.N91CZ.net >=20 >=20 >=20 >=20 >=20 > > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l --Apple-Mail-3-609872118 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
Your pictures apply to CONTROL surfaces also!

Charlie K.
See me on the web
        
www.Lancair-IV.com

Sent from my iPad


On Nov 28, 2011, at 10:52 AM, Chris Zavatson <chris_zavatson@yahoo.com> wrote:

There was another item observed during the trim tab examination that deserves mentioning.  I have seen this on other Lancairs as well.  The concept really applies to any hinged control surface. 
Wherever flow transitions from one flying surface to another, i.e. wing to aileron or flap, horizontal stab to elevator, or elevator to tab, care must be taken to ensure the trailing surface is in line with or slightly protrudes into the slip stream. (see sketch)  Flow readily separates if the in-trail surface is not in proper alignment.  Best case is one merely suffers a drag penalty.  Worst case is the effectiveness of the surface is compromised.  Many control surface designs will intentional project the leading edge into the slipstream during control surface deflection to assure flow remains attached.  In the case of the the trim tab, the separated flow served as an excitation on the loose tab.  This, in turn, got the elevator oscillating which was felt in the control stick. 
 
Chris Zavatson
N91CZ
360 std




<TabFlow.jpg>
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