D 7. Slide a silicone retainer over the threaded end of
two 36" threaded pushrods. Thread a nylon clevis 13 turns
onto each pushrod. Slide the pushrods into the rudder and
elevator outer pushrod tubes. Connect the clevises to the
control horns and mark the pushrods where they enter and
exit the outer pushrod tubes.
D 10. Disconnect the clevises from the control horns and
make a 90' bend at the marks you made. Cut the pushrod
3/8" above the bend. Connect the pushrods to the servos
with faslinks.
Note: If necessary, enlarge the holes in the servo arms
with a 5/64" drill bit (or a #48 drill for precision).
D 8. Cut ten 1/4" long bushings from the 6-1/2" plastic
inner pushrod tube. Slide four bushings onto the pushrods,
evenly spaced between the marks. Adjust the bushings
nearest the marks so they will not come out of the ends of
the outer pushrod tubes. If the bushings slide easily on the
pushrods, use CA to hold them in position.
D 9. Reinstall the pushrods in the outer pushrod tubes and
connect the clevises to the control horns. With the radio
switched on and the servos centered, position the control
surfaces to neutral. Mark the pushrod where it crosses the
mounting holes in the servo arm.
D 11. Install a silicone retainer and nylon clevis on the third
36" threaded pushrod. Bend and cut the pushrod to fit your
engine installation making sure that the muffler does not
interfere with the pushrod. Install two pushrod bearings on the
pushrod. Insert the pushrod in the throttle outer pushrod tube.
D 12. Install the Screw-Lock Pushrod Connector in the
throttle servo arm. Slide the throttle pushrod through the
pushrod connector and connect the clevis to the throttle
arm on the carburetor. With the radio switched on, adjust
the throttle trim to high. Move the throttle stick to full throttle
and move the throttle arm on the carburetor to open.
Tighten the 4-40 x 1/8" cap screw in the pushrod connector.
Check the movement of the throttle. The carburetor should
not close completely when the throttle stick is moved to low.
The carburetor should close completely only when the
throttle trim is moved to low. An outer pushrod tube bracket
can be made from leftover plywood with a notch cut in it
and glued to former F-8A.
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