Model Tech Sukhoi SU-31 Assembly Instructions Manual page 22

❑ Double-check that both the servo horn and the rudder are still centered. If necessary, thread the clevis in or out to center the
rudder, then move the rudder right and left several times to ensure proper movement.
Step 3: inStallinG the eleVator Control linkaGe aSSeMBlY
❑ Install the 90º bend in the 5-1/4" (133mm) long pushrod wire into the hole
that you enlarged, using the nylon snap-keeper provided. When installing the
snap-keeper, make sure it "snaps" firmly into place over the pushrod wire.
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The pushrod wire should be orientated on top of the servo arm, as
shown.
❑ Center the rudder servo (the bottom servo), then install the servo horn
onto the servo, making sure that the servo horn is centered and pointing
down toward the bottom of the fuselage.
❑ Install the servo horn retaining screw to secure the servo horn to the
servo.
❑ Cut two pieces of silicone fuel tubing (not included) 1/4" (6mm) long.
❑ Slide the two pieces of silicone fuel tubing onto the pushrod wire.
❑ With both the rudder servo horn and the rudder centered, thread one
nylon clevis onto the pushrod wire and snap the clevis into the fourth hole
out from the base of the control horn.
❑ Slide one piece of silicone fuel tubing up over the snap-keeper and the
other piece up over the clevis. The fuel tubing will prevent the clevis or
snap-keeper from opening during flight.
❑ Position and mark the mounting hole locations for the control horn on the
top left side of the elevator. When aligned properly, the centerline of the
control horn should be 3/4" (19mm) out from the side of the fuselage and the
clevis attachment holes should be lined up over the hinge line. The base of
the control horn should be parallel to the hinge line, too, so that the control
horn will line up with the pushrod wire.
❑ Install the control horn and backplate, using the same techniques that
you used to install the rudder control horn and backplate.
IMPORTANT Don't forget to apply a couple of drops of thin C/A to the
pilot holes.
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