of scrap wood in the round hole near the center of the wing. This
string is used to pull the aileron servo chord through the wing,
from the servo mount towards the center section, in the following
steps.
a) Working on one aileron at a time, plug a 6" servo extension
chord onto the end of your aileron servo wire. Secure this con-
nection with a piece of plastic tape.
b) With a needle nose pliers, grab hold of the scrap wood in
the servo mount opening. Gently break the wood loose from the
wing structure, and then pull the wood and string a couple inches
out of the opening. Untie the string from the wood piece, and re-
tie it securely to the end of your aileron servo chord.
c) Now break loose the other end of the string at the center of
the wing, and carefully begin pulling the end of the aileron chord
down into the servo mount opening and through the wing. You
will encounter obstructions as the servo plug bumps into the rib
structure inside the wing. When you do, don't pull too hard on the
string! You will find that by gently tugging back and forth alter-
nately on the string at the center and then on the servo chord at
the opening, that you can eventually work the plug past the ob-
structions. Keep feeding the servo chord through the wing until
the end plug comes out the hole at the center of the wing. Re-
move the string from the end of the servo chord. Tape the servo
chord to the wing surface so it cannot fall back into the hole.
d) Mount the aileron servo in the wing, using the screws that
came with the servo.
e) Repeat steps 5a) through d) to install the other aileron
servo in the other wing panel.
❑
6) In this step we will install a Nylon Control Horn on the bot-
tom of each aileron. Make sure the horn is directly in line with the
servo arm, and that the base of the horn is right at the front edge
of the aileron. Follow these steps.
a) First, with a sharp hobby knife or razor blade shorten the
pegs on the bottom of the
control horns, so the pegs
won’t poke through the cov-
ering on the top side of the
ailerons. Cut off half the
length of the pegs.
b) Hold the control horn
in correct location on the
aileron and when you have it in the correct position, press down
so the pegs on the bottom of the horn puncture through the cov-
ering and make a mark on the balsa aileron.
c) Drill a 1/16” dia. pilot hole into the aileron at both marked
locations. Do not drill completely through the aileron, just far
enough to accept the control horn pegs.
d) Use a sharp knife to remove the small strip of covering ma-
terial between the two holes. Then, glue the nylon control horn in
place using thick CA glue. Apply a small amount of glue to the
two pegs and a small amount of glue to the bottom of the control
horn base itself. Firmly press the horn into the two pre-drilled
holes in the aileron, until the base bottoms out on the surface. If
any glue oozes out onto the covering, it can be easily removed
with SIG CA Debonder.
e) Repeat this process to mount the other aileron control horn.
❑
7) In preparation for installing the aileron pushrods, center the
aileron servo output arms in neutral position. Also, secure the
ailerons in neutral position with small pieces of tape.
a) Working on one aileron at a time, slide one of the nylon
pushrod keepers over the plain unbent end of the aileron pushrod
wire.
b) Insert the Z-bend end of the aileron pushrod wire into the
outermost hole of the servo output arm (if the holes in your servo
arm are too small for the wire, drill out the holes with a #60 or
3/64" dia. drill bit).
c) Hold the pushrod wire against the side of the nylon control
horn and use a fine tip pen to mark the exact position of the con-
trol horn hole on the wire. NOTE: The wire will be installed in the
2nd hole from the end of the horn.
5