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Point of the Pivot
It's
critical for proper rudder response to either adjust it at
the servo or at the rudder horns. See the pictures below
for an idea of what I’m talking about.
Figure #1
shows the linkage with the pivot over the hinge line. The
bolts at the rudder were bent to get this relationship.
Notice that the servo wheel pivots are opposite each other
on the wheel, at the center of the wheel's rotation.
Figure #2
shows the offset of the pivot points on the rudder back
behind the hinge line. Again the servo wheel connections
are opposite each other, but they're not at the servo's
center of rotation. This setup goes against what we talked
about last month but is needed to get the geometry correct
for the cables. You see that the connections on the servo
wheel are adjusted a distance that's equal to the offset at
the rudder horns.
Applying
this linkage principle gives a better feel to the rudder,
and the cables won't be getting slack or going tight as they
come through center. I run my cables extremely tight and I
have no problems if the linkage looks like Figure #1 or #2.
But if the servo setup is like Figure #1 and the rudder horn
is like #2 then your rudder control won't perform as well as
it should.
Next: Control Horns
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