Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 8)

8
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1. Tape waxed paper over the Rudder drawing on the
fuse plans. Remove the die-cut 1/4” balsa parts R2,R3,R4
and R5 from CUB4RO1. Place all the parts over the plan in
their locations and check the joints for good fits. Use a T-bar
or other flat sanding block to make any necessary
adjustments. Pin the parts to the building board after proper
alignment and fitting has been done.
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2. Cut the rudder LE from the 1/4" x 3/4" x 24" balsa
strip (CUB4SO3). NOTE: Look over the three CUB4S03’s
and mark the straightest one to be used later for the stab
TE. Fit the LE into the notch in R3 and against the edge of
R5. Cut the horizontal frame section from the 1/4" x 3/4"
balsa strip and fit it in position. Pin the LE and horizontal
frame section in place and securely glue all joints with thin
CA. Wipe any excess glue off with a paper towel before it
cures (this will make sanding much easier). NOTE: Leave all
the parts pinned to the building board.
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3. Cut the four Ribs from the 3/16” x 1/4” x 24” balsa
stick (CUB4SO4). Fit the ribs into the rudder frame and
securely glue them in place with thin CA.
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4. Remove the Rudder from the building board and
inspect all the glue joints on the bottom side. Add thin CA to
all the tight fitting joints and thick CA to any open joints.
NOTE: The process of re-gluing the joints on the bottom
side is necessary on the thick balsa parts. This will ensure
the complete wicking of the CA throughout the entire joint.
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5. Place the Rudder on a flat work surface and lightly
sand both sides flat and smooth using a T-Bar or good flat
sanding block with medium grit sandpaper.
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6. Carefully draw a centerline on the LE and TE of the
rudder. This will help you to maintain symmetry when
sanding these edges.
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7. Using a flat sanding block, sand the top and the TE of
the rudder to a rounded shape. Sand the LE to a “V-shape”
as shown on the plans.
Build the Rudder
TAIL FEATHERS