I am in the process of building a plane and want to incorporate trim tabs on
the elevator. I have built the elevator and tabs and am looking at help with
the set-up. I was wondering if anyone had any experience with a set-up that
worked and could relate that to me.
1. What connectors-linkage used.
2. What throws did you use.
3. Were the connections on top or below the horizontal stab.
Thanks for the help!
If it's a scale model you're sorta stuck with whatever the prototype
had - some had exposed simple linkages, some had hidden linkages, and
the degree of difficulty should be oblivious.
If you don't care about scale appearance you can do it any way you
want, and it doesn't matter whether the linkages are on top or bottom.
What's more important is to get an appropriate ratio between the areas
of the elevator and tab.
While not trim tabs per se, boost tabs are very similar with respect
to linkages, except that the anchored end of the linkage on a trim tab
is attached to the elevator, and the anchored end of the linkage on a
boost tab is attached to the _stab_. Otherwise the linkages can be
One thing to keep in mind where servos are controlling the flight surfaces is
that the trim tabs will work backwards to those on a real aircraft that depend
on airflow to bring the control surfaces to a neutral position in flight. Not a
big deal but something to remember.
I have a not yet completed 96" Zlin 50L that has live boost tabs on the
elevators and ailerons. With the new generation of servos they are just for
the "wow" factor rather a necessity