GREAT PLANES Cherokee .40 ARF Instruction Manual page 10

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10. Use tape or a small clamp to hold the aileron in
the neutral position. Make a mark on the pushrod where it
crosses the outer hole in the servo arm. Make a 90° bend
at the mark on the pushrod and cut off the excess pushrod
1/4" [6mm] beyond the bend. Attach the pushrod to the servo
arm using a nylon FasLink. Thread the clevis up or down
on the pushrod as necessary to center the aileron with the
servo arm centered. When satisfi ed, slide the silicone clevis
retainer to the end of the clevis to secure it.
Skip to step 13 if you are not installing operational fl aps.
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11. Install the fl ap servo onto the fl ap servo hatch cover
in the same manner (the fl ap servos do not require servo
extensions). Install the hatch cover to the wing panel using
four #2 x 3/8" [9.5mm] self-tapping screws and four #2 fl at
washers. Be sure to harden the screw holes with thin CA.
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12. Install a control horn onto the fl ap using two #2 x 3/8"
[9.5mm] screws. Make note that these screws are shorter
than the ones used for the aileron control horns. As you did
with the aileron, install a 4" [102mm] pushrod onto the fl ap.
Before connecting the pushrod to the fl ap servo, use your
radio system to operate the fl ap servo through the whole
range of motion. In order to achieve the recommended fl ap
defl ection, use the end-point adjustment on your transmitter
to reduce the servo travel to approximately 50% of total (30
degrees, if applicable).
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13. Route the servo lead(s) through the hole in the top
of the wing panel.
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14. Repeat steps 1 to 13 for the other wing panel. When
installing the fl ap servo in the other wing panel (if applicable),
make note that both fl ap servos must be oriented in the same
direction (one fl ap servo arm will be facing the root rib and the
other fl ap servo arm will be facing the wing tip), in order for them
both to rotate the same direction when joined with a Y-harness.
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