Great Planes ESP6 Easy Sport 60 - GPMA0152 - Manual (Page 14)

NOTE: Do not be too concerned if the ribs do not line up
exactly with the plan. Sometimes the humidity will cause
the plan to expand or contract. Just remember to line up
the leading edge, trailing edge and ribs with the outside
edge of rib #7 (rib #6 on the Easy Sport 60). Let the
pre-cut notches take care of the spacing.
D D 6. Place the shaped and notched LE on the front of
the ribs. Once again, the end with the closely spaced
notches must face the wing root. Center the LE vertically
on the ribs, so the top and bottom edges of the ribs are
flush with the shaped LE. When certain that the shaped LE
is centered and in position, glue it to the ribs with thin CA.
D D 8. Insert the upper main spar and a 3/16" x 3/16" x
30" balsa front spar (3/16" x 3/16" x 32" basswood
front spar on the Easy Sport 60) into the notches in the
tops of the ribs. The upper main spar should be aligned
directly over the lower main spar. The upper front spar
should be flush with the outer edge of rib #7 (rib #6 on
the Easy Sport 60). Do not trim off any excess material
from the main or front spars yet.
D D 9. Make sure all ribs are vertical (90 degrees to
the work surface), that the spars are lined up and that all
parts are properly aligned. Glue the ribs to the upper,
lower and front spars with thin CA.
D D 10. With medium CA, glue the pre-cut 1/16" x
1-3/4" x 3-3/8" (3/32" x 2" x 3" on the Easy Sport 60)
balsa shear webs to the back of the main spars from rib
#5 thru #7 (rib #4 thru #6 on the Easy Sport 60) as
shown on the plans. It is not necessary for the webs to
be glued to the ribs.
D D 7. Put ribs #2, #3 and #4 in place on the main
spar. Note that the spar notches are cut extra wide to
allow for the wing joiners. Refer to the sketch and note
that it is most important to center the rib fore and aft,
providing equal space in front of and behind the spar.
Insert the ribs into their notches in the shaped LE and
TE. Center the ribs vertically on the LE (rib #2 will have
a 3/32" space on top and bottom when properly
centered). Glue both ribs to the shaped LE, TE sheet
and shaped TE with thin CA.
D D 11. Position one of the TE sheets on top of the
shaped TE so one end is even with the joint between
ribs #3-4 and glue it in place. NOTE: To get a good glue
joint you should properly position the TE sheeting and
apply thin CA where it joins each rib. Second, apply thin
CA along the rear edge where the sheeting meets the
small edge of the shaped TE. Finally, unpin and remove
the wing from the building surface. Stand the wing up so
the LE is up and the TE is down and drip a couple of
drops of thin CA into the joint where the sheeting meets
the wide edge of the tapered TE.
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