Global Hobby AK-18, Instructions Manual

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18
Figure # 16
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2) When satisfied with the alignment, use a
5/64” drill bit, and the control horn as a guide, and
drill the mounting holes through the rudder.
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3) Mount the control horn to the rudder by in-
serting the four 2mm x 25mm machine screws through
the control horn mounting base, through the rudder and
into the backplate. Tighten the screws, but do not over-
tighten them. You do not want to crush the wood.
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4) Using a modeling knife, remove the covering
from over the rudder pushrod exit slot in the rear of the
fuselage. The center of the slot is located on the left
side of the fuselage, 3-5/8” in front of the rudder hinge
line and 1-3/4” below the horizontal stabilizer. The
slot is 1-1/2” long and 3/16” tall.
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5) Slide the rudder pushrod assembly through
the fuselage and out the exit hole. To make this easier,
drop a piece of string through the exit hole and into
the servo bay. Tie the piece of string to the wire and
carefully pull the string. This will guide the pushrod
wire out the exit hole.
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6) Thread one nylon clevis onto the threaded end
of the rudder pushrod wire. For security, thread the
clevis on no less than 5/16”.
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7) Attach the clevis to the outermost hole in the
control horn. See photo # 27 below.
INSTALLING THE RUDDER PUSHROD
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8) Install two adjustable servo connectors
through the third hole out from the center of one
dual-arm servo arm. You may have to enlarge the
holes in the servo arm to accommodate the servo
connectors. Remove the excess material from the
arm. See figure # 17 below.
Figure # 17
After installing the adjustable servo connectors
apply a small drop of Kwik Bond thin C/A to
the nuts. This will prevent the nuts from coming loose
during flight.
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9) Slide the adjustable servo connector/servo
arm assembly over the rudder pushrod wire and over
the steering pushrod wire. The steering pushrod wire
fits through the opposite adjustable connector.
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10) Use a couple of pieces of masking tape to
hold the rudder in neutral.
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11) Plug the rudder servo into the receiver and
center the servo. Place the servo arm onto the servo.
The servo arm should be positioned perpendicular to
the fuselage sides.
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12) With both the rudder, the nose gear, and the
servo arm centered, tighten the set screws in the two
adjustable servo connectors. Remove the excess wires
using wire cutters and install the servo arm retaining
screw.. See photo # 28 below.
Photo # 28
the bottom of the rudder at the hinge line. Position the
control horn so the clevis attachment holes are directly
in-line with the hinge line. See figure # 16 below.
Photo # 27
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13) Move the rudder servo back and forth a
couple of times. There should be no binding in the
rudder pushrod or steering pushrod present.
Control
Horn
Backplate
Machine
Screw
Servo
Arm
Set
Screw
Servo
Connector
Washer
Nut
Washer
Pushrod
Wire
Control
Horn
Clevis
Rudder
Pushrod
Steering Pushrod
Adjustable
Connectors