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Step 19
Remove the backplate from a control horn. Thread a clevis
onto the 2-inch (51mm) rudder pushrod and attach the
clevis to the control horn. Make sure to cut a 1/4-inch
(4mm) piece of tubing to slide onto the clevis before
attaching it to the control horn.
Step 20
Position the control horn on the fin so it won't interfere
with the elevator, and so it is in alignment with the rudder
servo arm. Mark the location for the three mounting
screws on the rudder.
Section 12: Rudder and Servo Installation
Step 21
Drill the three holes for the control horn mounting screw
and harden the surrounding wood with thin CA. Mount the
control horn using three 2-56 x 7/8-inch machine screws
and the control horn backplate. Mark the pushrod where
it crosses the outer hole of the rudder servo arm using a
felt-tipped pen.
Step 22
Bend the pushrod 90 degrees at the mark and secure it
to the rudder servo arm. You will need to cut the pushrod
wire using side cutters so it will not interfere with the
rudder when operated.
Step 23
Repeat Steps 19 through 21 to install the remaining
rudder and rudder servo.
63
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