Great Planes Yak-55M 50-55cc Sport / 3D ARF - GPMA1230 User Manual
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2. Inside the aileron servo compartment you will fi nd a
string. Tie the string to the servo lead. The other end of the
string is taped to the root wing of the rib. Pull the leads through
the wing and then tape the servo lead to the wing to prevent
it from falling back into the wing.
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3. Place your servo onto the mounting blocks. Drill a
1/16" [1.6mm] hole through the servo mounting tabs into the
mounting blocks. Secure the servos to the mounting blocks
with the screws that came with your servos.
Note:
When
installing the servo into the wing, the end of the servo with the
spline should be located towards the trailing edge of the wing.
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4. The aileron servo
will require a 1" [25mm]
servo arm to get the
required aileron throw.
We recommend that a
high strength metal
servo arm be used. For
our model we used the aluminum Futaba arm (FUTM2120).
Open up the outermost hole in the servo arm by drilling a 1/8"
[3.2mm] hole through it.
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5. Install the servo
arm to the servo as
shown. Be sure to apply
thread locker to the
spline screw.
Hinge Line
Hinge Line
CORRECT
INCORRECT
Hi
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6. Located in the aileron is a plywood mounting plate.
If you look at the control surface at a slight angle you will be
able to see the plate through the covering. Draw a line from
the outer hole of the servo horn perpendicular to the hinge
line with a felt tip marker. Place a large nylon black control
horn on the plate, in line with the line you have drawn. Position
the control horn on the hinge line as shown in the illustration.
Drill a 3/32" [2.4mm] hole through each of the holes in the
control horn. Drill only through the plywood plate. Do not
drill
through the top of the control surface
. Mount the horn with
four #4 x 1/2" [13mm] screws.