X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 19 Mar 2014 08:07:11 -0400 Message-ID: X-Original-Return-Path: <2thman1@gmail.com> Received: from mail-pd0-f174.google.com ([209.85.192.174] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6786113 for lml@lancaironline.net; Tue, 18 Mar 2014 18:30:07 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.174; envelope-from=2thman1@gmail.com Received: by mail-pd0-f174.google.com with SMTP id y13so7760079pdi.33 for ; Tue, 18 Mar 2014 15:29:31 -0700 (PDT) X-Received: by 10.68.196.168 with SMTP id in8mr13433095pbc.132.1395181771760; Tue, 18 Mar 2014 15:29:31 -0700 (PDT) X-Original-Return-Path: <2thman1@gmail.com> Received: from [10.242.148.96] ([166.170.41.200]) by mx.google.com with ESMTPSA id jd5sm55972304pbb.18.2014.03.18.15.29.29 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 18 Mar 2014 15:29:30 -0700 (PDT) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-AD5BA5BC-4B98-4856-A4F8-71F6D6AB49B9 X-Original-Message-Id: Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (11D167) From: John Barrett <2thman1@gmail.com> Subject: Re: [LML] Re: Autopilot servos and L360 bobweight X-Original-Date: Tue, 18 Mar 2014 15:29:26 -0700 X-Original-To: Lancair Mailing List --Apple-Mail-AD5BA5BC-4B98-4856-A4F8-71F6D6AB49B9 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Thanks for the enlightenment, Chris and others. I did assume the discussion= was about a counterweight system. John Sent from my iPad > On Mar 18, 2014, at 12:14 PM, Chris Zavatson wr= ote: >=20 > John, > I think you are mixing up the counterweight and the bob-weight. The count= erweight is indeed there to prevent flutter by mass balancing the control su= rface. Removing the bob-weight will reduce the stick force/g. Lancair expe= rimented with reducing or eliminating the bob-weight many years ago. I don'= t recall the details however. > Chris Zavatson > N91CZ > 360std > http://www.n91cz.net/=20 >=20 >=20 > On Tuesday, March 18, 2014 10:33 AM, Chris Zavatson wrote: > Jack, > The bob-weight changes the slope of the stick force gradient. It is alrea= dy very shallow. Removing the weight would make it even more so. =20 > What is the nature of the 'inconsistent' altitude hold, a long and slow me= andering (likely a static source lag issue) or a short and quick movement (l= ikely a gain or sensitivity issue). >=20 > Chris Zavatson > N91CZ > 360std > http://www.n91cz.com/ >=20 >=20 > On Tuesday, March 18, 2014 6:55 AM, Jack Dysart wrot= e: > My Tru Trak autopilot altitude hold is inconsistent, and opinions are that= the servo had difficulty working properly because of the mass of the bobwei= ght on the elevator idler arm. One possibility is to remove the weight and e= xpect more pitch sensitivity (lighter stick force) in turns. Has anyone fou= nd other alternatives? > What if the mass of the bobweight is reduced? > =20 > My servo is behind the seat and connected to a ring clamp on the elevator c= ontrol tube with a smaller, roughly parallel, rod with bearing ends. > =20 > Jack Dysart =20 >=20 >=20 >=20 >=20 --Apple-Mail-AD5BA5BC-4B98-4856-A4F8-71F6D6AB49B9 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Thanks for the enlightenment, Chris an= d others.  I did assume the discussion was about  a counterweight s= ystem.

John

Sent from my iPad

=

On Mar 18, 2014, at 12:14 PM, Chris Zavatson <chris_zavatson@yahoo.com> wrote:
<= br>
John,
I think you are mixing up the c= ounterweight and the bob-weight.  The counterweight is indeed there to p= revent flutter by mass balancing the control surface.  Removing the bob= -weight will reduce the stick force/g.  Lancair experimented with r= educing or eliminating the bob-weight many years ago.  I don't rec= all the details however.
Chris Zavatson
<= div>N91CZ
360std


On Tuesday, March 18, 2014 10:33 AM, Chris Zavatson <chris_zavatson@yahoo.com> wrote:
<= div style=3D"color: rgb(0, 0, 0); font-family: times new roman, new york, ti= mes, serif; font-size: 14pt; background-color: rgb(255, 255, 255);">
Jack,
The bob-weight changes the slope of the stic= k force gradient.  It is already very shallow.  Removing the weigh= t would make it even more so.  
What is the= nature of the 'inconsistent' altitude hold, a long and slow meandering= (likely a static source lag issue) or a short and quick movement (like= ly a gain or sensitivity issue).

<= /span>
Chris Zavatson
N91CZ
360std<= /div>


On Tuesday, March 18, 2014 6:55 A= M, Jack Dysart <jldysart1@gmail.co= m> wrote:
My Tru Trak autopilot altitude hold is incons= istent, and opinions are that the servo had difficulty working properly beca= use of the mass of the bobweight on the elevator idler arm.  One possib= ility is to remove the weight and expect more pitch sensitivity (lighter sti= ck force) in turns.  Has anyone found other alternatives?
What if the mass of the bobweight is reduced?<= /div>
 
My servo is behind the seat and connected to a ring clamp o= n the elevator control tube with a smaller, roughly parallel, rod with beari= ng ends.
 
Jack Dysart    


=20


=
= --Apple-Mail-AD5BA5BC-4B98-4856-A4F8-71F6D6AB49B9--