Top Flite TOPA0405 - Manual (Page 14)

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3. Use 30-minute epoxy to glue the die-cut 1/8"
plywood wing ribs W-5 between the laser-cut 1/8"
birch ply rib doublers W-5W and W-5Z. Use
30-minute epoxy to glue the die-cut 1/8" plywood
wing ribs W-4 between the laser-cut 1/8" birch ply
rib doublers W-4W and W-4Z. Take extra care to
not get epoxy in the slots for the main spars and
the retract rails.
IMPORTANT: Be sure to make a left and right
rib assembly.
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4. Glue a die-cut 1/4" balsa aft aileron TE
(A) centered on a die-cut 1/4" balsa forward
aileron TE (F). Use a sanding bar to taper the
two pieces slightly as shown in the wing
cross-section drawing on the plan. These pieces
are die-cut slightly long to allow you to trim off
any imperfections.
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5. Pin a 3/8" x 1/2" x 42" basswood main
spar to the building surface using the
cross-pinning technique shown in the sketch. Allow
the main spar to overhang the plan at the root end.
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6. Glue the die-cut 1/8" balsa ribs W-2, W-3
and W-6 through W-12 to the main spar. These
should be perpendicular to the building surface
and aligned over their appropriate locations. Pin
the jig tabs located at the aft end of the ribs to the
building surface.
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7. Use 6-minute epoxy to glue the
pre-assembled ribs W-4 and W-5 to the main spar.
Make sure the W-4W and W-5W face each other.
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8. Glue the aileron wing TE assembly to the
aft edge of ribs W-8 through W-12. The upward
facing edges of the ribs and the TE assembly
should be flush. Make sure the jig tabs on the ribs
are touching the building surface.
NOTE: The inboard end of the aileron TE extends
approximately 1-1/8" inboard of rib W-8.
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