Top Flite TOPA0410 - Manual (Page 15)

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❏ 10. Use epoxy to glue the die-cut 1/8" [3.2mm] birch ply
forward spar doublers (FSD) to the forward center main
spar (the 1/8" birch ply main spar), aligning the doubler
with the slot for the landing gear strut and the top and
bottom of the center main spar.
❏ 11. Use epoxy to glue the die-cut 1/8" [3.2mm] birch ply
aft spar doublers (ASD) to the aft center main spar (the
1/8" lite ply main spar), aligning the doubler with the slot
for the landing gear strut and the top and bottom of the
center main spar.
❏ 12. Use 6-minute epoxy to glue the forward rib R-1 and
R-2 assemblies perpendicular to the center main spar
and forward spar doublers. Be sure to align the slot for the
landing gear rail, in the ribs, with the slot in the spar
doubler. Remove any excess epoxy from the landing gear
rail slots before the epoxy cures.
❏ 13. Glue the die-cut 1/8" [3.2mm] balsa forward ribs R-3
through R-5 in their respective locations, perpendicular to
the center main spar.
❏ 14. Test fit the two die-cut 1/8" [3.2mm] plywood wing
dowel plates (WDP) in the slots in the sub ribs R-6A.
Check the alignment of the assembly with the marks on
the center main spar. When satisfied with the fit, use
epoxy to glue the dowel plates to the ribs and the ribs to
the main spar, making sure the ribs are perpendicular to
the main spar.
❏ 15. Support the ends of the center main spar. Glue the
die-cut 1/8" [3.2mm] balsa aft ribs R-3 through R-6,
perpendicular to the aft side of the center main spar, flush
with the top and bottom edge.
❏ 16. Use epoxy to glue the die-cut 1/8" [3.2mm] plywood
aft ribs R-1A and R-2A, perpendicular to the aft side of
the center main spar and the aft spar doubler.
❏ 17. From the remaining 1/2" x 7/8" balsa stick, make
two 7/8" tall blocks to support the aft ends of ribs R-1A
and to prevent the center section from twisting. Tack glue
the blocks to the ribs. Pin the blocks to your building board
and weight down the center section.
❏ 18. Glue the balsa TE assembly, centered on the aft
end of the ribs.
❏ 19. Center the LE assembly on the forward end of the
ribs. Glue the LE to ribs R-1 and R-2.
❏ 20. Insert the die-cut 1/4" balsa LE triplers from the
bottom, between ribs R-2 and R-5 and glue in place. Glue
ribs R-3, R-4, R-5 and R-6 to the LE.