Great Planes Extra 300S 1.60 ARF - GPMA1365 - Manual (Page 13)

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1. On left side of the fuselage you will find two servo
openings. On the right side you will find one. Cut the
covering from the servo openings.
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2. Install your left elevator servo into the forward servo
compartment on the left side of the fuselage. Drill a 1/16"
[1.6mm] hole through each of the mounting holes in the servo.
Remove the servo. Insert and then remove a servo mounting
screw into each of the holes you have drilled. Put a drop of thin
CA into each hole and allow the glue to cure. The servo will
require a 24" [610mm] extension to reach the radio
compartment. Install the extension onto the servo and secure it
using the same method used on the ailerons. Install the servo
in the compartment with the hardware provided with your servo.
Center the servo. Then install a servo arm onto the servo. The
servo arm should be pointing towards the bottom of the stab.
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3. Repeat step two for the right side of the fuselage.
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4. Look closely on the bottom of the left elevator and
you will notice a plywood plate visible under the covering.
The control horn must be mounted to this plate. Place a
control horn in position on the elevator in line with the servo
arm. Mark the location of the four mounting holes. Drill a
5/64" [2mm] hole through each of the marks, being careful
not to drill through the top of the elevator. Insert and then
remove a #4 x 5/8" [16mm] screw into each of the holes you
have drilled. Put a drop of thin CA into each hole and allow
the glue to cure. Install the control horn with four #4 x 1/2"
[13mm] screws.
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5. (Referring to the photo at step 7 will help you
understand the following step.) Install a 4-40 nut, silicone clevis
keeper and a threaded 4-40 aluminum clevis onto the threaded
end of a .095 x 12" [2.4 x 305mm] pushrod. Tighten the nut
against the clevis. Install the clevis in the second hole from the
end of elevator control horn. Install a 4-40 solder clevis in the
last hole on the servo arm. Center the elevator and mark the
wire where it needs to be cut to be the correct length to fit into
the solder clevis. Remove the clevises from the horns. Then cut
the wire on the mark you made.
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6. Solder the wire to the clevis using the technique
described for the ailerons.
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7. Install the completed pushrod to the elevator and
servo, securing the clevis with the silicone clevis keeper.
Note: If you plan to use your Extra 300S primarily for 3D flying,
read the optional rudder servo installation on page 20.
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8. Repeat steps 4-7 for the right side of the fuselage.
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9. Install the rudder servo in the remaining opening on the
left side of the fuselage. The rudder servo should be a
minimum torque rating of 87 oz. in. Use the same installation
method and pushrod technique you used for the elevator.
Install the Elevator & Rudder
Pushrods & Servos
13