From: marv@lancair.net
Subject: Re: TruTrack problems
To: <lml@lancaironline.net>
Date: Wed, 28 Feb 2007 18:04:18 -0500
Message-ID: <web-1874900@logan.com>
In-Reply-To: <3D198611D82D094D898E5F5CCF22050A010DEC82@RUCKBE011C8MB03.nase.ds.army.mil>
References: <3D198611D82D094D898E5F5CCF22050AE2CEA0@RUCKBE011C8MB03.nase.ds.army.mil>
 <web-1721043@logan.com>
 <3D198611D82D094D898E5F5CCF22050A010DEC82@RUCKBE011C8MB03.nase.ds.army.mil>
MIME-Version: 1.0
Content-Type: text/plain;charset="iso-8859-1";format="flowed"
Content-Transfer-Encoding: 8bit


Posted for "Gigliotti, James M Mr DCD\(CAMBER\)" 
<james.gigliotti@us.army.mil>:

  Wolfgang Meyn wrote:
  
"""
  So today I would like to ask you to chime in and maybe the two groups
  together can shed more light into the darkness and get TruTrak to the
  point that they fix these ongoing problems.
  
  What I am specifically interested in is:
  
  1.                   What TT unit do you use?
  2.                   What problems did you encounter?
  3.                   Under what conditions do the problems occur?
  4.                   What fix did TT offer?
  5.                   Did the fix work?
"""
  
  	Hello Wolfgang
  
  	I have been using the TT Altrak VS Altitude Hold and Pictoral
  Pilot for about 6 months now.  I had heard scuttlebutt that aircraft
  like the Lancair can have difficulties with porpoising with the altitude
  hold engaged.  Sure enough, I have that problem. 	
  	The Altrak has three settings to control the activity level.
  These settings have a pronounced effect on the porpoising, but the best
  I can get still leaves me with occasional minor porpoising that occurs
  maybe two or three times during a typical flight in calm air.  I can
  control the problem somewhat by adding some up-trim to the elevator, but
  this doesn't always work.  The porpoising is not severe, but I'm certain
  if I were in clouds, it would be sever enough for me to want to
  disengage the altitude hold if I were not able to correct the problem
  after a minute or two.
  	I haven't contacted TT directly yet to discuss this problem with
  them.  I'm hopeful that, when I do, they will have some good tips for
  me.
  
  	I wonder if anyone else has had this difficulty, and what they
  did to solve it?
  
  Respectfully,
  
  Jim.