SIG Four-Star 20EP, Instruction Manual, Page: 20 / 26

.
d. Unhook the rear of the elevator pushrod from the control horn and slide the pushrod as far forward as possible. Cut off the
servo end of the pushrod wire at the longest mark.
e.
Bend the end of the pushrod wire over 90 degrees at the remaining mark (the first mark you made back in step b.) Make the
bend as sharp as possible.
f.
With a needle nose pliers, make another 90 degree bend back the other way, on the servo side of the mark - forming a "Z"
bend. Make the bend as sharp as possible.
g.
Unscrew the servo arm from your servo and install it on the "Z" bend of the
pushrod. Reinstall the servo arm.
h.
Plug the elevator servo into your radio system, make sure the elevator trim is
neutral, and then adjust the RC Link to get the elevator in neutral position.
Rudder Pushrod
69.
Repeat steps 67 and 68 to make and install the rudder pushrod wire.
70.
You need to support the front end of the outer nylon pushrod tubes to keep them
from flexing. Cut a 2-1/4" long piece of leftover 1/8"x3/8" balsa main spar stock to
make a suitable support. Hold the balsa support against the front of former F-3
and up against the bottom of the pushrod tubes. Mark the positions of both tubes
on the support. Take the support back out and make a small notch in the support
for each tube. Then put the support back in position and glue it to the back of F-3.
Also glue the pushrod tubes securely in the notches.
71.
Install your aileron servos in the wing using the hardware that came with the
servo.
Aileron Pushrods
72.
Two 2-56 x 10" long Threaded Rods are provided for the aileron pushrods.
a.
Thread a RC Link halfway onto the end of each rod.
b.
Mount a Nylon Control Horn on the bottom of each aileron. Check the exact location on the plan.
c.
Make a "Z"-Bend in the servo end of
each aileron pushrod.
Note: This wire is heavier than the wire
used for the elevator and rudder
pushrods. Trying to make the z-bend
with a needle nose pliers will be difficult.
This illustration shows a traditional
method for making z-bends with a
standard pliers.
1. Make the first 90 degree bend in
the end of the wire.
2. Make a second 90 degree bend,
perpendicular to the first.
3. Clamp the bent end with pliers or
a vise, and twist it to line up with
the main wire.