Great Planes F4 Phantom - GPMA0440 - Manual (Page 38)

12. Cut off the inner throttle pushrod tube, 1/2" aft of the 17. Center the rudder and mark the threaded rod where
outer pushrod. Cut off 1/2" of the threads on a 2-56 x 4"
threaded pushrod and thread the pushrod 1/2" into the end
of the throttle inner pushrod. it crosses the servo horn (on the opposite side of the
steering pushrod). Make a 90-degree bend at the mark and
cut off the excess wire 3/8" above the bend.
13. Install a Screw-Lock Pushrod Connector on the
18. Enlarge the servo horn holes with a 5/64" drill bit.
throttle servo horn. Do not use the locking washer until
after the control throws are adjusted. Adjust the throttle
control on your radio and the throttle arm on the carburetor
to full open. Insert the throttle pushrod through the pushrod
connector and install the servo horn on the servo. Tighten
the 4-40 x 1/8" socket head cap screw in the pushrod
connector and check the operation of the throttle. It should
open and close fully without stalling the throttle servo.
When satisfied, cut off the excess pushrod from behind the
pushrod connector and install the locking washer on the
pushrod connector.
19. Insert the pushrod into the servo horn and secure it
14. Make an outer pushrod retainer out of leftover
plywood. Glue the retainer to.F-8 and the outer throttle
pushrod tube to secure it in line with the servo horn.
with a nylon Faslink™ connector. With the servo horn
centered, adjust the nose gear so that it is straight. Tighten
the 4-40 x 1/8" socket head cap screw in the pushrod
connector and cut off the excess pushrod. Check the
operation of the rudder and steering making sure there is
no binding. If it operates freely, install the locking washer on
the steering pushrod connector.
20. Thread a nylon swivel halfway onto each elevator
torque rod.
21. Thread nylon swivel clevises 13 turns onto two
2-56 x 12" threaded rods. Thread a nylon clevis 13 turns
onto a 2-56 x 4" threaded rod.
22. Cut the 12" threaded rods to 5-1/2" long, measured
15. Remove two of the arms on a "cross" servo horn to
make a straight horn. Install a Screw-Lock Pushrod
Connector approximately 1/2" from the center of the servo
horn. Do not use the locking washer until after the control
throws are adjusted. Slide the steering pushrod through the
pushrod connector. Center the rudder servo and install the
servo horn on the servo, perpendicular to the centerline of
the servo. Secure the outer steering pushrod to F-8 with a
second pushrod retainer.
from the swivel clevis pin hole. Cut the 4" threaded rod to
3-1/4" long, measured from the clevis pin.
23. Attach the swivel clevises to the swivels. Slide the
1/4" split wire coupler over the two pushrods. Slide the
3-1/4" long pushrod into the split coupler from the other
end. Install the elevator servo horn, perpendicular to the
centerline of the servo. Attach the clevis to the servo horn.
16. Thread a nylon swivel on the rudder torque rod so
that it is 5/8" from the bend. Thread a nylon swivel clevis
13 turns onto a 2-56 x 12" threaded rod. Attach the swivel
clevis to the swivel.
24. Hold onto the split wire connector and operate the
elevators to check for any interference with the movement
of the pushrods.
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