REFLECTOR: Pitch Trim Mystery

[Ron Brown]

Sorry, John, I can't help you with that (is the circuit board a relay). I don't think so, but it could contain the relays.  Actually, there should be an up relay and a down relay.  If you have everything else shut down, you may be able to hear the relays click when you actuate the trim buttons.  Perhaps that will help you locate them - unless someone has used solid state relays.  

Can you determine what is on the circuit board?

Ain't it fun to work on a plane that someone else built???????  I have a hard enough time figuring out what I did!

Ronnie


  ----- Original Message ----- 
  From: John Dibble 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Thursday, March 23, 2006 5:06 PM
  Subject: Re: REFLECTOR: Pitch Trim Mystery


  Just looked for the relay.  One problem is that when the plane has sat for a day, the trim works fine.  Both up and down trim show over 12V across the wires going to the trim motor.  There is a small circuit board mounted inside the keel just behind the stick and it looks like some wires from the stick go there.  Also the wires going to the trim motor are white and all wires from the stick are various non-white colors and it looks like the white wires come from the circuit board.  Hard to see in there.  Is the circuit board a relay? 
  John 

  Ron Brown wrote: 

    John, I agree with TEC: If the trim switch is in the control stick, it probably has a very low power rating and needs to be actuating relays.  If there is a relay, you need to trouble shoot and determine if the problem is in the relay or the switch. If your trim switch is mounted on the panel (and involves no relays), then the switch needs to be replaced. Ronnie 
      ----- Original Message -----
      From: HYTEC45 at aol.com
      To: reflector at tvbf.org
      Sent: Thursday, March 23, 2006 11:38 AM
      Subject: Re: REFLECTOR: Pitch Trim Mystery
       In a message dated 3/23/2006 8:31:06 A.M. Pacific Standard Time, aminetech at bluefrog.com writes: 
        Any suggestions on what 
        to do with the switch?
      Use the switch to operate a relay (DPDT).  The relay can handle a larger load then the switch.  Plus, the relay is much easier to replace or trouble shoot in the event of future service.   I have an original military grip w/cooley hat.  It would be tough to find a replacement switch for that, so I elected to use relays to carry both the roll and pitch loads.  Has worked fine for 11 years. TEC 
--------------------------------------------------------------------------

      _______________________________________________ 
      To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector 
      Visit the gallery!  www.tvbf.org/gallery 
      user:pw = tvbf:jamaicangoose 
      Check new archives: www.tvbf.org/pipermail 
      Check old archives: http://www.tvbf.org/archives/velocity/maillist.html

----------------------------------------------------------------------------_______________________________________________
To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html

------------------------------------------------------------------------------


  _______________________________________________
  To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

  Visit the gallery!  www.tvbf.org/gallery
  user:pw = tvbf:jamaicangoose
  Check new archives: www.tvbf.org/pipermail
  Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20060323/131c8a2c/attachment.html