X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 05 Mar 2012 21:25:52 -0500 Message-ID: X-Original-Return-Path: Received: from qmta04.emeryville.ca.mail.comcast.net ([76.96.30.40] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5429557 for lml@lancaironline.net; Mon, 05 Mar 2012 16:47:35 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.40; envelope-from=j.hafen@comcast.net Received: from omta15.emeryville.ca.mail.comcast.net ([76.96.30.71]) by qmta04.emeryville.ca.mail.comcast.net with comcast id hwnN1i0051Y3wxoA4xmznH; Mon, 05 Mar 2012 21:46:59 +0000 Received: from [10.0.1.5] ([76.104.242.96]) by omta15.emeryville.ca.mail.comcast.net with comcast id hxmx1i01X25W5K88bxmymx; Mon, 05 Mar 2012 21:46:58 +0000 From: John Hafen Mime-Version: 1.0 (Apple Message framework v1257) Content-Type: multipart/alternative; boundary="Apple-Mail=_8324E41C-4B20-47B1-9E02-9C05C0AB334C" Subject: Re: [LML] LNC2 - Harminization between pitch and roll X-Original-Date: Mon, 5 Mar 2012 13:47:19 -0800 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: X-Mailer: Apple Mail (2.1257) --Apple-Mail=_8324E41C-4B20-47B1-9E02-9C05C0AB334C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Randy: It's the same on my IVP. If I sneeze, I will gain or lose 200 = feet without touching the stick. The aileron forces are so brutal that = I don't turn at all. I just go around the block. If I do need to turn, I use my knees to provide pressure assist. Works = for left turns, not so much for right turns. I don't notice it after a few hundred hours, but pilots new to the plane = freak out. =20 Cheers, John On Mar 5, 2012, at 1:41 PM, Randy Hartman wrote: To: All LNC2 drivers and anyone else that wants to weigh in on the = subject, =20 Subject: Stick force harmony (or stick movement vs. control surface = movement) between pitch and roll =20 My Lancair 360 (N360DE), which I have flown now for 450 hours, has an = characteristic that I would like some input on from all you = well-informed and intelligent LML readers and contributors. =20 The characteristic is: Very sensitive pitch axis that is not harmonized = with the roll axis. =20 I have gotten used to the difference and frankly don't plan on changing = anything about it unless someone out there has a good suggestion. I have some questions: 1. Is this typical of the LNC2? 2. What kinds of things should I be concerned about in considering = any changes to the linkage of the system? 3. Has anyone made any changes and what were the results? 4. Does anyone out there have any experience with using full pitch = deflection - in any portion of flight? I imagine it might be needed in = landing, full flaps, lower speeds - but I have not seen it. =20 It seems to me the way to make an increase in aileron sensitivity is to = change the mechanical linkage geometry to effectively make the control = surface move more degrees of rotation per degree of stick movement. = This would (and could) be done but the resultant would be the stick not = getting full deflection (as compared to now) in the cockpit when the = aileron was at full deflection. This might not be a bad thing because = right now the stick has to be jammed up against one or the other of your = thighs in order to get the aileron to full deflection. =20 Ideally I would like to have less sensitivity in pitch, resulting in = more stick deflection for the same pitch results as now - and less total = stick deflection in roll, which should result in more roll sensitivity. =20 For clarification purposes - my horizontal stab and elevator are a = one-off design of Chuck Brenner. Chuck was involved with part of the = construction of this project prior to my involvement with it. =20 Randy Hartman Cell (319) 360-9775 --Apple-Mail=_8324E41C-4B20-47B1-9E02-9C05C0AB334C Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Randy:  It's the same on my IVP.  If I = sneeze, I will gain or lose 200 feet without touching the stick. =  The aileron forces are so brutal that I don't turn at all.  I = just go around the block.

If I do need to turn, I use = my knees to provide pressure assist.  Works for left turns, not so = much for right turns.

I don't notice it after a = few hundred hours, but pilots new to the plane freak out. =  

Cheers,

John


On Mar 5, 2012, at 1:41 PM, Randy = Hartman wrote:

To: All LNC2 drivers and = anyone else that wants to weigh in on the subject,
 
Subject: Stick force harmony = (or stick movement vs. control surface movement) between pitch and = roll
 
My Lancair 360 = (N360DE), which I have flown now for 450 hours, has an characteristic = that I would like some input on from all you well-informed and = intelligent LML readers and contributors.
 
The characteristic is: Very = sensitive pitch axis that is not harmonized with the roll = axis.
 
I have gotten used = to the difference and frankly don't plan on changing anything about it = unless someone out there has a good suggestion.
I have some questions:
1. Is this = typical of the LNC2?
       What kinds of = things should I be concerned about in considering any changes to the = linkage of the system?
       Has anyone = made any changes and what were the results?
4. Does anyone = out there have any experience with using full pitch deflection - in any = portion of flight?  I imagine it might be needed in landing, full = flaps, lower speeds - but I have not seen it.
 
It seems to me the way to make = an increase in aileron sensitivity is to change the mechanical linkage = geometry to effectively make the control surface move more degrees of = rotation per degree of stick movement.  This would (and could) be = done but the resultant would be the stick not getting full deflection = (as compared to now) in the cockpit when the aileron was at full = deflection.  This might not be a bad thing because right now the = stick has to be jammed up against one or the other of your thighs in = order to get the aileron to full deflection.
 
Ideally I would like to have = less sensitivity in pitch, resulting in more stick deflection for the = same pitch results as now - and less total stick deflection in roll, = which should result in more roll sensitivity.
 
For clarification purposes - = my horizontal stab and elevator are a one-off design of Chuck = Brenner.  Chuck was involved with part of the construction of this = project prior to my involvement with it.
 
Randy = Hartman
Cell (319) = 360-9775

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