15
Required Parts
• Fuselage w/stabilizer
• 5
1
/
2
" elevator linkage (2)
• 8-32 x 2
1
/
4
" control horn screw (2)
• 8-32 flange nut (2)
• Molded swivel link (2)
• Ball link for swivel link (2)
• 4-40 x 1/2" socket head screw (2)
• 4-40 lock nut (2)
• Ball link for servo arm (2)
Required Tools and Adhesives
• Drill
• Drill bit: 1/16”
• 5” 4-40 linkage (2)
• Dental floss or string
• Aluminum servo arms (2)
• Control horn ball ends (2)
• 18” Servo Extensions (JRPA099) (2)
Note
: Using two standard rotation servos and
a standard “Y” harness for the elevators will
result in them moving in opposite directions
instead of the same direction. As such, the
elevator installation will either require the
use of one reversed rotation servo and one
standard rotation servo or a reversing “Y”
harness. It is highly recommended to use a
computer radio or a JR® MatchBox™ to link
the two elevator servos to operate properly.
The elevators require a minimum of 80 ounce inch of
servo torque. In the prototype Extras we used JR8231
and JR9411 servos with excellent results. Using
servos with less torque could cause a crash.
Step 1
Install an 18" servo extension onto an elevator
servo. Either tie the servo leads together, using a
commercially available connector, or use unwaxed
dental floss to secure the extensions to prevent them
from coming loose during flight. Install one side
only of the two Y-harnesses to two of the servos,
also tying knots to prevent disconnection. The other
two servos will be hooked up to the Y-harness when
installed in the airplane. One elevator servo will need
to be a reversed-direction servo.
Step 2
Install the servo in the fuselage tail section with the
output shaft to the rear as shown in the photo.
Step 3
Drill a 1/16" pilot hole before installing the screws.
Using the screws included with the servos, fasten the
servos in place.
Step 4
Mix a small amount of 30-minute epoxy and lightly
coat the inside of the hole in the elevator and the
8-32 x 2
1
/
4
" control horn screw. Thread the screw
into the hole from the top of the elevator. Wipe away
any excess epoxy on the wing and screw with rubbing
alcohol and a paper towel. Screw the 8-32 flange nut
in place as shown. Allow the epoxy to fully cure.
Section 5 – Elevator Servo Installation