Top Flite TOPA0705 - Manual (Page 21)

21
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3. Draw a straight line from the lower pushrod hole
to the rudder to indicate the position for the rudder
control horn. Repeat on the other side of the fuselage
and rudder.
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4. Mount the control horns to the elevators and
the rudder. Follow the same procedure used for the
ailerons, by drilling 3/32" [2.4mm] holes and using #4 ×
1/2" [12.7mm] sheet metal screws. Attach the elevator
clevis in the third hole from base of the control horn.
Don’t forget to harden the holes with thin CA after fi rst
installing, then removing the screws.
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5. Place two elevator and one rudder/ tailwheel
steering servos in the servo tray as shown. Make two
one-arm servo arms from the servo arms that came
with your servos. Position the servo arms as shown. A
2" [51mm} servo arm needs to be used on the rudder
servo. Many aftermarket servo arms are available. We
used the arm included with the Du-Bro Super Strength
Servo arm assortment (DUBM6670).
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6. Install solder clevises on the elevator servo arms
in the outer hole from the center of the servo arm.
Following the same procedure that was done for the
aileron and fl ap pushrods, mark the elevator pushrods
where they are to be cut for the solder clevises. One at a
time, remove the threaded metal clevis from the control
horn end, remove the pushrod from the fuselage, cut
it to the correct length and solder a metal solder clevis
on the end. Re-install the pushrod from the front and
connect the solder clevis to the servo arms. Re-install
the threaded metal clevis and 4-40 nut.
Don’t forget
to use a silicone clevis retainer on all the clevises.
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7. Thread a 4-40 nut and a 4-40 metal clevis, 12
turns, onto each of six 4-40 rigging couplers. Install
the clevises on the tailwheel steering servo arm in the
holes 5/8" [15mm] from the center of the servo arm.