Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 34)

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1. Hold the Large Nylon Control Horns on the elevator
and rudder in the positions shown on the fuselage plan and
mark the mounting hole locations. REMEMBER: The
elevator horn is located on the bottom of the elevator! Drill
3/32” diameter holes at these locations. Mount the control
horns with 2-56 x 5/8" screws (SCRW002) and the nylon
nutplates which were attached to the horns.
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2. Temporally mount the rudder and elevators to the fin
and stabilizer using the hinges provided.
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3. Mount three servos in the servo tray, using the screws
provided with the radio, as shown in the photo. Cut off all but
one arm on three large servo horns and install one on each
of the servos.
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4. Thread a nylon clevis with a clevis retainer onto each
of the two 36" long Rudder and Elevator pushrod wires
(WIRES17) until the threads are visible inside the clevis.
Insert the pushrod wires into the pushrod guide tubes
(previously installed) and attach the clevises to the elevator
and rudder horns.
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5. Tape the rudder and elevators in their neutral positions
and mark where the pushrod wires cross the holes in the
servo wheels with a permanent fine tip marker. Disconnect
the rudder and elevator clevises from the control horns and
remove the pushrod wires from the tubes. Cut the pushrod
wires off 5/16" past the marks you just made.
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6. Cut twelve 1/4" long pieces of 1/8" diameter inner
pushrod tube. Slide six of these “spacers” onto each of the
long pushrod wires and space them as shown on the fuse
plan. NOTE: If these spacers do not slide on easily, cut them
to a shorter length. Also, while installing the pushrods,
position the above plastic tube spacers so they always stay
inside the pushrod guide tubes. If the tubes are not a tight
friction fit on the pushrod wires, apply a very small drop of
thin CA to secure them.
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7. Replace the pushrod wires in the guide tubes and make
a 90 degree bend at the marks you made earlier. Insert the
bent portion of each wire in the correct servo horn and secure
it with a snap keeper. NOTE:You will probably have to enlarge
the holes in the servo horns with a 5/64" drill bit.
NOTE: The
THROTTLE PUSHROD location will vary, depending on
the engine used. Plan your installation carefully!
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8. With the engine attached to the mount, determine the
best routing for the throttle pushrod. The pushrod should
be located as close as possible to the fuse side (to allow
room for the fuel tank), and it should not have any tight
bends. Drill a hole in the firewall and F2A for the throttle
pushrod guide tube (not included).
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9. Install the throttle pushrod following the engine
manufacturer’s instructions and hook it up to the servo on
the right side of the plane as shown on the plans. See photo
at step 1 on page 40.
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10. Hook up your radio system and test the operation of
all three controls.
Install Servos, Horns and Pushrods
34