
38
Hangar 9 P-47D-40 Thunderbolt 30cc ARF
3. Remove the servo and use a pin vise with a 1/16-
inch (1.5mm) drill bit to drill the holes for the servo
mounting screws.
4. Thread a servo mounting screw in each of the holes
using a #1 Phillips screwdriver. Remove the screw, then
apply 2–3 drops of thin CA in each hole to harden the
surrounding wood.
5. Use the radio system to center the servo. This is done
by setting the throws to 0% in both directions. Install the
servo horn perpendicular to the servo. Use a pin vise and
5/64-inch (2mm) drill bit to enlarge a hole in the arm that
is 5/16 inch (8mm) from the center of the horn. Use side
cutters to remove any arms that may interfere with the
operation of the servo.
6. Secure the retract servo using the servo mounting
screws and a #1 Phillips screwdriver. Note that the servo
output faces away from the valve mount. Attach the retract
valve to the retract servo tray. Attach 4-inch (101mm) air
lines to the retract valve.
7. Assemble a linkage (not included) to operate the
retract valve. Adjust the linkage so the valve is centered
when the servo is centered.
8. Use the end points of the radio to set the throw of the
servo to operate the retract valve. Increase the throw from
0% (as set in step 5) in 1% increments to prevent damage
to the retract tray, servo or retract valve. Set both the up and
down throws at this time.