Finish The Servo Installation - GREAT PLANES RV-4 Instruction Manual

Finish the Servo Installation

1. Install a servo into the aileron servo bay in the right
wing following the radio manufacturer's instructions. Center
the servo, then install a servo arm onto the servo. The servo
arm should be installed 90 degrees to the servo case and
the arm should be pointing toward the wingtip. Enlarge the
end hole in the servo arm of the elevator and rudder servo
with a 1/16" [1.6mm] drill bit.
2. Place a straight edge at the end hole in the servo
arm. Make a mark on the aileron in line with the end hole in
the servo arm. Important: If you have had the ailerons off
and on the wing it would be a good idea to check to make
sure that you are working with the correct aileron. Press a T-
pin into the balsa skin of the aileron at the mark you have
just made. You should feel the pin push into the plywood
control horn plate. If you do not feel the plywood plate you
either have the wrong aileron or you have installed it upside
down. Do not proceed to the next step until the aileron is
correctly installed.
Correct
3. On the mark on the aileron install the aileron control
horn. Position the control horn so that it is centered on the
mark you made on the aileron. Using a felt tip pen, mark the
drilling locations for the screws. Drill a 1/16" [1.6mm] hole
through the marks. Saturate the holes with thin CA. After it
has cured, attach the control horn to the aileron with two #2
x 5/8" [15.9mm] sheet metal screws.
4. Locate a 2-56 x 12" [305mm] wire pushrod. Cut the
pushrod to a length of 4-3/4" [121mm]. On the threaded end
of the pushrod attach a clevis retainer and clevis by turning
it onto the threaded end approximately 25 turns.
Incorrect
5. Attach the clevis to the control horn. Then, slide the
clevis retainer in position on the clevis. Center the aileron,
and then make a mark on the wire pushrod where it meets
the outer hole in the servo arm. Make a 90 degree bend in
the wire on the mark you have made.
6. Insert the wire into the servo horn and retain it in
place with a nylon FasLink.
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