REFLECTOR: Elevator trim problem

[John Dibble]

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
>
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>
>
>
>      --
>      Mike W.
>      1997 Velocity Elite RG
>      Franklin /IVO Electric CS
>      Dual GRT EFIS HX Synthetic Vision
>
>      -------------------------------------------------------------
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