X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 19 Mar 2014 10:07:48 -0400 Message-ID: X-Original-Return-Path: Received: from mail-qa0-f45.google.com ([209.85.216.45] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6786709 for lml@lancaironline.net; Wed, 19 Mar 2014 08:20:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.216.45; envelope-from=pjdmiller@gmail.com Received: by mail-qa0-f45.google.com with SMTP id hw13so8509653qab.32 for ; Wed, 19 Mar 2014 05:20:06 -0700 (PDT) X-Received: by 10.140.85.230 with SMTP id n93mr40157992qgd.26.1395231606637; Wed, 19 Mar 2014 05:20:06 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.1.103] ([68.202.57.70]) by mx.google.com with ESMTPSA id e4sm62628811qar.12.2014.03.19.05.20.04 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 19 Mar 2014 05:20:05 -0700 (PDT) Subject: Re: [LML] Re: Autopilot servos and L360 bobweight References: From: Paul Miller Content-Type: multipart/alternative; boundary=Apple-Mail-6AC6F4ED-1E16-4A84-8EE8-DC610BCA2FB0 X-Mailer: iPad Mail (10B146) In-Reply-To: X-Original-Message-Id: <6385B701-E750-4E4A-96E4-3DB7230DA481@gmail.com> X-Original-Date: Wed, 19 Mar 2014 08:20:02 -0400 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-6AC6F4ED-1E16-4A84-8EE8-DC610BCA2FB0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Silvio, the servos are not really altitude sensitive but if you have a pitch= trim that has reduced voltage for speed reduction, that can be suspect. At= altitude try and see if pitch trim operates by gently holding very light pi= tch up or pitch down while in altitude hold mode. You should get a response w= ithin a second or two from pitch trim. Without pitch trim, you cannot contr= ol pitch. Have you a reduced trim speed potentiometer? Paul Legacy tru trak On 2014-03-19, at 8:07, Silvio Novelli wrote: > I also have a problem with my Tru Trak, it is not able to hold altitude ab= ove 9000 ft. Any comments? Bob weight is there to better stick force. My rec= ommendation is to keep it.=20 >=20 > Silvio Novelli > Lancair 320 PP-XSN > +55 (14) 9.9614-3129 >=20 >=20 >=20 >=20 > On 18 Jan 2014,w 12, at 11:41 AM, John Barrett wrote: >=20 > Bob weight is there to balance the control surface . Out of balance can ca= rry risk of flutter. Be sure to research before changing that relationship.= >=20 > John >=20 > Sent from my iPad >=20 >=20 > On Mar 18, 2014, at 6:52 AM, "Jack Dysart" wrote: >=20 >> My Tru Trak autopilot altitude hold is inconsistent, and opinions are tha= t the servo had difficulty working properly because of the mass of the bobwe= ight on the elevator idler arm. One possibility is to remove the weight and= expect more pitch sensitivity (lighter stick force) in turns. Has anyone f= ound 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= control tube with a smaller, roughly parallel, rod with bearing ends. >> =20 >> Jack Dysart =20 >=20 --Apple-Mail-6AC6F4ED-1E16-4A84-8EE8-DC610BCA2FB0 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Silvio, the servos are not really alti= tude sensitive but if you have a pitch trim that has reduced voltage for spe= ed reduction, that can be suspect.  At altitude try and see if pitch tr= im operates by gently holding very light pitch up or pitch down while in alt= itude hold mode. You should get a response within a second or two from pitch= trim.  Without pitch trim, you cannot control pitch.  Have you a r= educed trim speed potentiometer?

Paul
Legacy tru trak
=

On 2014-03-19, at 8:07, Silvio Novelli <ppxsn@novellisouza.com.br> wrote:

<= blockquote type=3D"cite">
I also have a problem with my Tru Trak, it is n= ot able to hold altitude above 9000 ft. Any comments? Bob weight is there to= better stick force. My recommendation is to keep it. 

     =  Silvio Novelli
 Lancair 320 PP-XSN
+55 (14) 9.9614-3129<= /div>

On 18  Jan 2014,w 12, at 11:41 AM, John Barrett wrote:
Bob weight is= there to balance the control surface . Out of balance can carry risk of flu= tter.  Be sure to research before changing that relationship.

John

Sent from my iPad


O= n Mar 18, 2014, at 6:52 AM, "Jack Dysart" <jldysart1@gmail.com> wrote:

My Tru Trak autopilot altitude hold is inconsistent, and opinions a= re that the servo had difficulty working properly because of the mass of the= bobweight on the elevator idler arm.  One possibility is to remove the= weight and expect more pitch sensitivity (lighter stick force) in turns.&nb= sp; Has anyone found other alternatives?

What if the mass of the bobweight is reduced?

 

My servo is behind the s= eat and connected to a ring clamp on the elevator control tube with a smalle= r, roughly parallel, rod with bearing ends.

 

Jack Dysart   &nb= sp;


= --Apple-Mail-6AC6F4ED-1E16-4A84-8EE8-DC610BCA2FB0--