REFLECTOR: Elevator trim problem

[John Dibble]

I eliminated the solid state relay and wired the stick buttons directly
to the trim motor.  Took 2 short flights today and it worked perfect.  I
know that's not much time, but on the previous flight it began trimming
up by itself right after leveling off at 1000 ft, so I'm cautiously
optimistic.  If anyone, not using a relay with a Mac stick,  has had
problems, I'd really like to hear from you.

Thanks,

John

John Dibble wrote:

> I'm seriously thinking about that.  Maybe with an additional switch to
> switch between the stick buttons and the toggle so I can keep the
> stick controls which work most of the time.
>
> John
>
> Douglas Holub wrote:
>
>> All arguments for a single DPDT (on) off (on) toggle switch on the
>> panel for elevator trim, on the left side where it's easy to reach
>> with the left hand. Only one robust component.
>>
>>      ----- Original Message -----
>>      From:Michael Watson
>>      To: Velocity Aircraft Owners and Builders list
>>      Sent: Thursday, January 12, 2012 12:29 PM
>>      Subject: Re: REFLECTOR: Elevator trim problem
>>       John,
>>
>>      I also have a Mac 7 stick. Last year I had a problem with
>>      an intermittent up button.
>>      I called Mac and they sent me two new buttons to replace
>>      the up and down ones.
>>      No problems since. I think your up button may be sticking.
>>      Unscrew the two screws
>>      under the head four or five turns, twist the head left to
>>      right while pressing the up button
>>      and see if it sticks. Find a position that it moves up and
>>      down smoothly then tighten the
>>      screws.
>>
>>
>>
>>
>>      On Thu, Jan 12, 2012 at 10:15 AM, John
>>      Dibble <aminetech at bluefrog.com> wrote:
>>
>>           While we're on this subject, I need help with an
>>           issue with my elevator
>>           trim.  Over the past 100 hours, infrequently it
>>           seems to trim up
>>           uncommanded.  I push forward on the stick to
>>           keep level and push the
>>           trim down button.  For a second or two nothing
>>           happens.  Then it
>>           responds properly.  I know if I press both
>>           buttons at once, nothing
>>           happens, so I'm guessing that there is still an
>>           up input in the second
>>           or two when nothing happens.  I have a solid
>>           state relay that failed
>>           once.  In that case the output voltage reduced
>>           to where the motor
>>           wouldn't run.  I have a Mac 7 stick.  On the
>>           ground the buttons operate
>>           well with no sign of sticking.  I have several
>>           questions.
>>
>>           Where is the mechanism that prevents operation
>>           when both buttons are
>>           pressed?  In the stick?  In the relay?  In the
>>           motor?
>>
>>           Can I eliminate the relay and run full current
>>           through the stick?
>>
>>           I may wire lights to the leads going to the
>>           motor so I can confirm when
>>           current is being sent to the motor.
>>
>>           Thanks,
>>
>>           John
>>
>>           _______________________________________________
>>           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
>>
>>
>>
>>
>>      --
>>      Mike W.
>>      1997 Velocity Elite RG
>>      Franklin /IVO Electric CS
>>      Dual GRT EFIS HX Synthetic Vision
>>
>>      -----------------------------------------------------------
>>
>>      _______________________________________________
>>      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/20120115/4718d796/attachment-0001.htm>