Great Planes SU-31 Sukhoi EP 3D ARF - GPMA1547 - Manual (Page 11)

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o 9. Attach a control horn to the right side of the rudder in
the same manner.
INSTALL THE TAIL SERvOS & PUSHROdS
o 1. Trim the covering from the elevator and rudder servo
bays on both sides of the fuselage as shown. Note: Please
pay close attention to the location of the servo mounting
holes in the preceding pictures. There are several lightening
holes in this area of the airframe that might be mistaken for
servo mounting holes. The servo mounting holes can be
distinguished because they have sharp 90° corners.
o 2. Attach a 12" [305mm] slim servo extension to the
elevator and rudder servos. Use your radio system to center
the servos. Before installing the servos, test fit double-sided
servo arms to determine which arm is closest to perpendicular
with the tail servo case sides. Cut off the arm that is not used.
If neither of the servo arms are close to perpendicular with
the servo case sides, locate the single-sided servo arm and
check it. Secure the servos in the servo bays with the splines
facing forward. If using CA glue to mount the servos, do not
forget to trim the covering so that the servo mounting tabs
can be glued directly to the wood underneath.