12
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7. Drill 5/64" [2mm] holes at the marks you made. Install the
rudder control horn using two 2-56 x 1/2" [13mm] machine
screws and a control horn backplate. Trim off the part of the
backplate that overhangs the rudder hinge line.
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8. Remove the pushrod from the rudder pushrod tube.
Thread a nylon clevis 20 complete turns onto the pushrod.
Slip a silicone clevis retainer onto the clevis. Reinstall the
pushrod into the pushrod tube and clip the clevis into the
second outer hole in the rudder control horn.
BUILDER TIP
MUST-HAVE ACCESSORY
Installing clevises onto pushrods can be tedious using pliers
and your fi ngers. Using a wrench is a little easier but it has
a tendency to slip off the hexagonal base and is awkward
to use. Picking up a clevis installation tool will make short
work of getting clevises threaded onto pushrods and is way
easier on your fi ngers. We keep one within reach during
every ARF and kit build we do. Our favorite version is the
Great Planes Clevis Tool GPMR8030.
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9. Prepare your rudder servo by fi rst using your radio
system to electronically center it. Choose a servo arm that
has a hole 1/2" [13mm] from the servo arm center. Enlarge
that hole with a 5/64" [2mm] drill bit and cut off the unused
arms. Install the servo arm onto the servo as shown. Install
the servo grommets and eyelets.
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10. Place the servo in the tray as shown and position it so
that the rudder pushrod passes over the enlarged servo arm
hole. Mark and drill holes in the tray to mount the servo. If
