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While the 10A servo can be made to work on the Legacy (and
MarkII) elevator trim tab it will require creating extra clearance between the
plastic clevis and the aluminum horn. Also, extra travel on the tab itself
will need to be established. The slick solution is to use the -7A
servo. Ray Allen Company converted a -10 into a -7 for me one time.
The two clevises need to have about .1" removed from their small ends and
assembled to a hole to hole length of about 1.25". With the -7 servo, if
the linkage is set to provide .6" up travel on the trailing edge of the tab,
relative to the elevator trailing edge, and down travel of .9" everything should
clear although enlarging the bottom of the clevis slot will give a bit more
safety margin. This has proven to be enough trim travel for a properly
balanced Legacy. Actually, very little nose down trim is needed. If
the -10 servo is used the arm on the tab will have to be radiused on the front
and the clevis notch deepened, but it can be done. Please don't forget
that up-tab is nose down and vice versa. Bias the tab for more nose up
than down. By the way, the -7 has more than enough travel for the rudder
trim, if you use it.
Leighton Mangels
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