Great Planes ElectriCub Kit - GPMA0156 - Manual (Page 13)

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❏ ❏ 12. Position the die-cut 3/32" balsa ribs W-2 and W-3 in
position. Important: Rib W-2 does not fit into the notch in the
LE. Rib W-2 fits into the notch in the TE and aligns with the
alignment marks on the wing plan in front of the LE. Glue
only W-3 to the LE, TE, main spar and center sheeting.
❏ ❏ 13. Position the top 3/16" basswood spar in the rib
notches with one end flush with the outside edge of the tip
rib and glue to all the ribs except W-2.
❏ ❏ 14. Position the die-cut 3/32" balsa rib W-1 in place
between the main spars, with the bottom edge flat against
the center sheeting. Use the die-cut 1/8" ply dihedral
gauge to set the rib at the proper angle (see the drawing on
the wing plan). Position the die-cut 3/32" balsa LE joiner
between ribs W-1 and W-2. When you have W-1, W-2 and
the LE joiner positioned properly, glue them in place.
❏ ❏ 15. Glue the two die-cut 1/8" ply wing strut plates in
position. The wing strut plates must be flat on the table, flush
with the bottom of the wing.
❏ ❏ 16. From the 1/16" x 3" x 30" balsa sheet, cut and glue
vertical grain shear webs to the spars in the locations
shown on the plan. It is not necessary for the shear webs to
be glued to the ribs. Make sure they are glued securely to
the wing spars. Do not install shear webs in the rib bays
between ribs W-1 and W-3.
❏ ❏ 17. Carefully sand the top of the LE joiner flush with the
top of ribs W-1 and W-2.
❏ ❏ 18. From a 1/16" x 3" x 30" balsa sheet, cut pieces to
make the top center section sheeting (don’t forget the 1/16"
notch for the dihedral brace). When satisfied with the fit,
apply medium CA to the top of the ribs and press the
sheeting in place. Note: If the balsa sheeting supplied in
your kit is difficult to bend over the front portion of the ribs
without cracking, wet the top surface of the sheeting with
water. The water will soften the wood, making it much easier
to bend.
❏ ❏ 19. From one of the remaining 1/4" x 1/4" x 13" balsa
sticks, cut four 1" long hinge blocks. Glue the hinge blocks
in position, centered on the TE.