Section 4: Installing The Aileron Linkage - Hangar 9 J-3 Piper Cub Assembly Manual

Section 4: Installing the Aileron Linkage

Parts Needed
Wing assembly from Section Three
Aileron linkages (2)
Control horns with linkages (2)
Clevis (2)
1. Center the aileron servos by plugging the Y-harness into
the aileron channel in the receiver. Turn on both the
transmitter and receiver and center the aileron trim lever
on the transmitter. Select a servo arm that has a hole
located between 10-12 mm out from the center.
2. Install the arm onto the aileron servo so the arm is
positioned 30° toward the leading edge of the wing.
See photo below.
Note: The 30° control horn offset provides the necessary
aileron differential (more up aileron than down) to correct
adverse yaw tendencies of the J-3 Piper Cub. If your radio's
system is equipped with aileron to rudder mixing, you may also
want to mix approximately 25% aileron to rudder mixing to
further improve the turn coordination. Interestingly, both full and
scale models of the J-3 Piper Cub exhibit these flight tendencies.
3. Place a piece of masking tape on the top of the aileron
cover so the edge of the tape lines up with the output hole
on the servo arm. See the photo below.
12
Tools Needed
Drill
1/16" drill bit
Z-bend pliers
Small Phillips screwdriver
4. Reinstall the aileron cover on the wing. Place an aileron
linkage perpendicular to the aileron hinge so it passes
directly in line with the servo arm under the aileron cover.
With a felt tipped pen, mark the center location of the
aileron control horn.
5. Center a control horn over the mark you just made.
Carefully align the clevis' attachment holes (4) so they
are directly in line with the aileron hinge.
6. Using a pencil, mark the screw hole locations (2) for the
control horn.
Felt tipped pen
Pencil
Masking tape
Fuel tubing (optional)