Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Mon, 29 Mar 2004 15:08:46 -0500 Message-ID: X-Original-Return-Path: Received: from rwcrmhc12.comcast.net ([216.148.227.85] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3133951 for lml@lancaironline.net; Mon, 29 Mar 2004 12:44:58 -0500 Received: from comcast.net (h0050e4f9850f.ne.client2.attbi.com[24.34.165.190]) by comcast.net (rwcrmhc12) with SMTP id <200403291744560140076kmte> (Authid: N2811A); Mon, 29 Mar 2004 17:44:57 +0000 X-Original-Message-ID: <40686098.8050007@comcast.net> Disposition-Notification-To: Angier & Gynna X-Original-Date: Mon, 29 Mar 2004 12:44:56 -0500 From: Angier & Gynna User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: Elevator balance-lnc2 References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------010107080105050208080206" This is a multi-part message in MIME format. --------------010107080105050208080206 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Compared to aileron balancing, my elevators are turning out to be a challenge, the simple reason being that with the ailerons, the center of mass is significantly below the hinge line. The elevator hinges are on the centerline (or at least they are supposed to be). My hinges turn out to be a hair low, thus the elevator center of mass is above the hinge line and I cannot get the counterweight arm to stay in position at about 3/4" below the HS before applying paint (I'll call this the reverse pendulum effect). When the elevator is deflected up or down, it tends to want to keep on going (slowly) to full deflection... Now, if I flip the elevator over and reposition it on my balancing jig, the center of mass is now slightly below the hinge line and if it were attached to the plane, I'd be in inverted flight :-) :-) . So, without a doctorate in physics, my simple minded reasoning says that I should balance the inverted elevator such that the counterweight maintains a position of about 3/4" above the HS mark on my jig, prior to paint. All, please feel free to poke holes in this logic or confirm that this would be another way to skin the cat. Thanks, Angier Ames --------------010107080105050208080206 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Compared to aileron balancing, my elevators are turning out to be a challenge, the simple reason being that with the ailerons, the center of mass is significantly below the hinge line. The elevator hinges are on the centerline (or at least they are supposed to be). My hinges turn out to be a hair low, thus the elevator center of mass is above the hinge line and I cannot get the counterweight arm to stay in position at about 3/4" below the HS before applying paint (I'll call this the reverse pendulum effect). When the elevator is deflected up or down, it tends to want to keep on going (slowly) to full deflection...

Now, if I flip the elevator over and reposition it on my balancing jig, the center of mass is now slightly below the hinge line and if it were attached to the plane, I'd be in inverted flight :-) :-) .

So, without a doctorate in physics, my simple minded reasoning says that I should balance the inverted elevator such that the counterweight maintains a position of about 3/4" above the HS mark on my jig, prior to paint.

All, please feel free to poke holes in this logic or confirm that this would be another way to skin the cat.

Thanks,

Angier Ames
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