GREAT PLANES ElectriCub Instruction Manual page 12

3. Cover the left wing panel plan with wax paper or
Great Planes Plan Protector.
4. Match the 3/16" x 3/16" x 26-1/4" basswood main
spars so any warps will counteract each other.
5. Pin one of the main spars in position over the plan,
aligning one end of the main spar with the outside edge of
the tip rib W-4.
6. Pin one of the die-cut 1/8" balsa trailing edges,
notches facing up, in position over the plan. The TE is
notched at one end and not the other. The notched end goes
toward the wing root (wing center).
7. Glue two of the die-cut 1/16" balsa W-4 ribs together
to make the tip rib.
8. Place the W-4 ribs onto the main spar and into the
notches in the trailing edge.
9. Carefully insert the W-4 ribs into the notches in the
leading edge. Note: Do not be concerned if the ribs do not
line up exactly with the plan. Sometimes the humidity will
cause the plan to expand or contract. Just make sure to line
everything up with the outside edge of the last rib. The
notches will provide the proper spacing.
10. With the ribs, LE and TE flat against the building
surface, glue the W-4 ribs to the spar, LE and TE.
11. From a 1/16" x 3" x 30" balsa sheet, cut the wing
center sheeting to fit between the TE and main spar and
the LE and main spar. Make sure to leave a 1/16" slot, for
the dihedral brace, in the sheeting at the back of the main
spar. Pin the sheeting in position. Then, glue the sheeting to
the main spar, LE and TE.
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