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Chapter 9 -
Rudder
9.1 - Rigid point on the
stringer Page 148
9 Rudder
The four-seat aircraft rudder is mounted similar to the elevator or aileron mounting
procedures. As with other assemblies, we start by locating and identifying the component
parts. The right and left sides should be easily identified by viewing their respective
location on the aircraft. The right side will be used first in this setup. The left side has
radius on the leading edge.
Remove any peel ply and other burrs from the two molded parts. Be careful to avoid
breaking the thin panels and also to avoid cutting yourself with the thin corners.
Sand the corners to remove sharp corners and materials which extend beyond the
molded corners. Sand the piece finishing it.
Locate the marked parts of the spar and ribs and cutout from the laminate panel
provided. Drill a 1/8-inch ventilation hole through the center of each back rib.
8.9 Rigid point on spar
Identify the cutout in the spar and prepare a rigid point for the actuator arm.
Establish and mark on the front face.
Mark a line “4 ½” up from the bottom edge, cut a strip from the face layers about 1
¼” wide centered on this mark, and remove the core material to the back face.
Insert a 1 ¼” wide and ¼ inch thick phenolic strip into this cutout with a MICRO
paste behind and filling any gaps at the corners.
With the spar on a flat surface, cover the phenolic with at least 1 spare inch in each
corner with 2 layers of BID.