Great Planes Pitts Special 1/3 Scale ARF MonoKote - GPMA1218 - Manual (Page 18)

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1. Cut the covering 1/8" (3mm) inside the opening in the
fuselage for the two elevator and one rudder servos. Use a
trim iron to seal the covering to the edges of the opening.
When cutting the covering from the servo bays, refer to the
photograph in STEP 8 on PAGE 19 for proper placement of
servos. Cut the covering from two servo bays on the right
side of the fuselage. On the left side of the fuselage cut only
the covering from the servo bay closest to the stab. Note:
You can place your rudder servo on either side of the fuse
as a servo bay is provided on both sides. Do not cut the
covering from both sides unless you intend to use two
servos for the rudder.
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2. Place the grommets and brass eyelets onto your
servos as shown in the sketch above. Depending on your
choice of radio operation, connect either a 12" (305mm)
servo extension wire (HCAM2711) or if using a Y-Harness
(HCAM2751) connect it to one elevator servo, secure it with
tape or heat shrink material, and place the servo into the
servo bay. Run the remaining end of the Y-Harness through
the opening and connect it to the second elevator servo,
secure it with tape or heat shrink material, and place the
servo into the servo bay.
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3. With the servos in position in the fuselage, drill 1/16"
(1.6mm) holes in the fuselage for the servo mounting
screws. Using the technique described on Page 8, mount
the elevator servo using the supplied screws.
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4. Position the elevator control horns directly in line with the
servo arms and with the hinge alignment as shown above. At
both locations mark and drill the four 1/8" (3mm) holes for
each of the horns. Saturate these holes with thin CA, wiping
away any residue and allow it to fully harden. Then re-drill the
holes to allow the screws to pass through easily. Mount the
control horns and back plates to the two elevators with eight
4-40 x 3/4" (19mm) socket head screws.
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5. Install two 4-40 threaded metal clevises, two 4-40 hex
nuts, and two clevis retainers onto two 12" (305mm) 4-40
pushrods approximately 15 turns. Attach these two push
rod assemblies to the control horns. Attach two 4-40 solder
clevises to the two elevator servo arms.
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6. Center the servo arm on the servo and align the
elevators with a straight edge. Holding the push rod assembly
and the 4-40 Metal Solder Clevis on the servo arm in place,
mark the location of the push rod as shown in the sketch
above with a felt tip pen. Cut the push rod off at this point and
solder the clevis into place. Repeat this procedure for the
remaining elevator and also for the rudder servo.
Important: The installation of the two elevator servos
presents a number of options that you must consider at
this time as it does affect the manner in which you must
mount these two servos. If you are using a radio system
that is capable of setting up the two servos on different
channels and then mixing them together for the elevator
operation (see your radio system manual), you must
mount both servos in the same direction with the servo
arms placed in the same direction. This would also apply
if you used one reversed servo. Another option, and
probably the best, is the Futaba SR10 / Dual Servo
Synchronizer and Reverser (FUTM4150). The SR-10 is
also compatible with the majority of other R/C
manufacturer’s systems.
If you plan to use a simple Y-harness system for both
elevator servos you must make sure that your servos are
mounted in the same direction but with the servo arms
pointing in opposite directions.
Install the Servos
18