Great Planes Piper J-3 Cub 20 Kit - GPMA0158 - Manual (Page 8)

D 4. Cut the ribs from the 3/16" x 3/16" x 24" balsa stick.
Position the ribs in the rudder frame and glue them in place
with thin CA.
D 3. Cut the three ribs from the 3/16" x 3/16" x 24" balsa
stick to fit between the forward and aft frames. Position two
ribs above the lower frame for additional bracing and the
third rib at the location shown on the plan. Glue the ribs to
the frame with thin CA.
D 4. Remove the fin from the building board and inspect all
the glue joints. Apply thick CA where necessary.
D 5. Remove the rudder from the building board and
inspect all the glue joints. Add thick CA to any open joints.
D 1. Pin the die-cut 3/16" balsa fin leading edge R1 in
place on the plan.
D 2. Cut the fin top, fin base and the inner and outer fin
TE from the remaining 3/16" x 5/8" x 18" balsa sticks.
Check the fit and sand their mating edges as needed. Pin
the parts in place, then glue them together with thin CA.
NOTE: Leave all the parts pinned to the building board.
D 1. Work over waxed paper covered plans. Place the
die-cut S1, S2, S3 and S4 balsa parts over the plan to
check their fit. Sand their mating edges as needed and pin
the parts in place.
D 2. Cut the Stabilizer TE from the 3/16" X 5/8" X 18"
balsa stick you set aside earlier. Fit the TE between the S4
parts on the plans. Glue all the parts together with thin CA.
NOTE: Leave the parts pinned to the building board.
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