Model Tech Sukhoi SU-31 Assembly Instructions Manual page 21

❑ Push the two servo leads into the servo lead hole, then firmly slide the
servo leads through the fuselage and up to the servo lead exit hole.
❑ Carefully pull the servo leads out the servo lead exit hole.
Step 2: inStallinG the rudder Control linkaGe aSSeMBlY
❑ Position and mark the mounting hole locations for the control horn on the
left side of the rudder. When aligned properly, the centerline of the control
horn should be 1-3/8" (35mm) up from the bottom of the rudder 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.
❑ Drill 5/64" (2mm) diameter pilot holes through the rudder for the control
horn mounting screws, then apply a couple of drops of thin C/A to the pilot
holes and allow the C/A to fully cure.
☞
The C/A will harden the surrounding balsa, making the mounting area
stronger.
❑ Install the control horn and backplate, using two M2 x 16mm machine
screws.
❑ Cut away all but one arm from a "4-point" servo horn, then enlarge the
outermost hole in the servo arm, using a 5/64" (2mm) diameter drill bit.
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