Great Planes Ryan STA-M 1.20 ARF - GPMA1355 - Manual (Page 18)

❏
9. Hold the fuselage vertically with the nose pointing
upward. Guide the end of one of the cables with the clevis
attached down through the fuse out one of the holes for the
rudder. Connect the clevis to the torque rod horn on the rudder,
then temporarily fit the rudder to the fin with a the hinges.
❏
10. Use masking tape to securely hold the rudder
centered. Determine the correct length of the cable so it may
be connected to the rudder servo arm with another brass
coupler and metal clevis. The tension on the cable should be
about the same as a slightly loose guitar string–neither slack
nor taut. Connect the cable to the coupler the same as
before using a swage. Connect the clevis to the rudder servo
arm. On our model, the clevis was connected to the second-
from-the-innermost hole of a Futaba four-arm servo arm.
❏
11. Connect the other rudder cable to the rudder and the
other side of the rudder servo arm the same way. Adjust the
clevises on the threaded couplers so the tension on the
cables is as desired and the rudder is centered when the
servo arm is centered.
❏
12. Now that the rudder hookup is completed, remove the
servo arm from the rudder servo while leaving the pull/pull
clevises connected to it. Pull the rudder from the fin and
disconnect the clevises from the torque rod horns, but leave
the cables inside the fuselage.
❏
13. Cut holes in both halves of the molded plastic rudder
fairing to accommodate the torque rod horns on the rudder.
This is best done with a rotary tool and a cutting bit. Also cut
a slot in both fairings for the bottom rudder hinge.
❏
14. The same as was done for the fin and stab, place the
fairings on the rudder and use a felt-tip pen to mark the top
of the fairing onto the rudder. Cut the covering from the
rudder 1/16" [1.6mm] below the line, but leave part of the
covering around the threaded rod.
❏
15. Use tape or small clamps to hold both halves of the
rudder fairing to the rudder. Be certain the fairing fits well.
Test fit the rudder to the fin with the fairing. Use thin and
medium CA to carefully glue the fairing to the rudder. Note:
Use great care with the CA and use it sparingly so it does
not flow out of the fairing onto the outside of the rudder!
❏
16. Reconnect the clevises on the aft end of the rudder
cables to the torque rod horns on the rudder. Tighten the
nuts on the threaded couplers against the clevises. Join the
rudder to the fin with the hinges. Be certain the hinges
remain centered. If necessary, use pins to keep the hinges
centered, then securely glue in the hinges with thin CA.
❏
17. Attach the servo arm with the cables to the rudder
servo. If necessary, adjust the length and tension of the
rudder cables to get the rudder centered when the servo
arm is centered.
18