Great Planes Yak-55M 50-55cc Sport / 3D ARF - GPMA1230 - Manual (Page 14)

14
DOUBLE SERVO INSTALLATION
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1. For the dual rudder
servo arm installations
you will need two of the
aluminum servo arms
included in the kit and two
of the round servo disks
included with your radio
system. The round servo
disk needs to be at least 1"
[25mm] in diameter.
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2. Position the aluminum servo arm on top of the disk.
Drill a 3/32" [2.4mm] hole through the aluminum arm, through
the disk. Do this for all four holes. Secure the arm to the disk
with four 2-56 x 1/2" [13mm] machine screws and 2-56 nuts.
Be sure to secure the nut with a drop of thread locker. After the
nuts are secure, cut off the thread from the bolt that extends
above the nut. This can be done with a high speed motor tool
or a good side cutter. Do this for both servo arms.
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3. Install your servos into the rudder servo tray using
the hardware that came with your servo. Center the servos
and then install the servo arm.
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4. Locate two 4-40 x 5-3/4" [146mm] thread pushrod wires.
Cut off the threaded end of the wire leaving an unthreaded
wire 3-1/2" [89mm] in length.
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5. Locate four heavy duty screw lock connectors, metal
retainer clips and 4-40 x 1/4" [6mm] socket head cap screws.
Install the connector into the outer hole of the servo arms and
secure them with the retainer clips. Center both servos and
then install the two 4-40 wires into the connectors. Secure
the rods with the 4-40 screws. Be sure to apply a couple of
drops of thread locker to each screw.
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6. Use wire cutters to cut the supplied braided cable into
two equal lengths. Slide a small tube (called a swage) over the
end of one cable. Then, guide the end of the cable through
the threaded brass coupler and the back through the swage.
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7. Wrap the cable back around and through the swage.