REFLECTOR: Pitch Trim Mystery

[Scott Baker]

The answer depends on the load carrying specifications of the switch.  Make sure the switch is rated for DC current.  Composite Design makes a 4-way trim relay board, which can be purchased through Aircraft Spruce or through the Velocity parts department.  It's a nice board - works great - easy to install.  A trim relay board allows just about any size of trim switch to be installed in the control stick.
SB
  ----- Original Message ----- 
  From: Tom Martino 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Thursday, March 23, 2006 12:17 PM
  Subject: RE: REFLECTOR: Pitch Trim Mystery


  I probably did a stupid thing.  But I connected my control stick switches directly to the trim motor and breaker.  There is no relay in between.  I know it is just a matter of time before the switches say "goodbye".

   

  Question:  Is there an easy way to connect a relay (up near the trim actuator) where it is easy to get to the wire leads?  My logic says "yes" . but I want to hear from those who have retrofitted/

   

  Thanks

   

  -----Original Message-----
  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Ron Brown
  Sent: Thursday, March 23, 2006 10:06 AM
  To: Velocity Aircraft Owners and Builders list
  Subject: Re: REFLECTOR: Pitch Trim Mystery

   

  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


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