Top Flite TOPA0155 - Manual (Page 28)

W12 and in the die-cut 1/8" [3.2mm] balsa mid TE
spar (MTES), the outer TE spar (OTES) and the
aileron spar (AS) so they can be joined together at
the angle shown on the plan.
❏ ❏
4. Join the ribs to the mid TE spar, outer TE
spar and the aileron spar. Fit one of the outer main
spars into the notches in the bottom of the ribs. Place
the assembly over the plan. Use T-pins to hold the
spars to the building board (or use the same balsa
sticks used on the center section to hold the spars to
the plan).
❏ ❏
5. The same as was done for the bottom main
spar of the center section, make shims from leftover
balsa to raise the bottom main spar of the outer
panel up into the notches in the ribs, but be certain
the ribs remain in contact with the plan. Due to the
taper of the wing, the shims nearer the root of the
wing will be thicker than the shims nearer the tip.
❏ ❏
6. With the shims underneath, pin the bottom
outer main spar to the building board.
❏ ❏
7. Glue all ribs except rib W6 to the TE spars
and the bottom outer main spar. Be certain the ribs,
especially rib W12 at the wing tip, are vertical.
❏ ❏
8. Making certain the ribs remain vertical, glue
the top outer main spar to ribs W7 through W12.
❏ ❏
9. Join the die-cut 1/8" [3.2mm] balsa outer LE
spar (OLES) to the assembly and glue it to ribs W7
through W12.
❏ ❏
10. Use the die-cut 1/8" [3.2mm] plywood
dihedral gauge (DG) to set rib W6 at the correct
angle. Holding W6 at the correct angle, glue it to the
rest of the assembly.
❏ ❏
11. Use a razor plane followed by a bar sander
with 80-grit sandpaper to shape the top main spar
and the LE spar even with the top of the ribs.
❏ ❏
12. Trim one of the 3/32" x 9" x 24" [2.4 x 229
x 610mm] balsa sheets prepared earlier as shown in
the sketch. Glue the cut-off piece back to the sheet
as shown. After the glue dries sand the sheet flat.
This is the top wing skin.
❏ ❏
13. Trim the top wing skin to fit the wing.
Remove or relocate any T-pins that will be concealed
under the top wing skin. Glue the skin into position.
❏❏
14. Remove the wing panel from the building board.
❏ ❏
15. Use 30-minute epoxy to glue two die-cut
1/8" [3.2mm] plywood outer webs (OW) to the front
and back of the top and bottom main spars. The
same as when gluing the inner webs to the center
section, use enough epoxy for a secure bond, but
don’t use too much epoxy so that it interferes with the
fit of the wing joiners later on. Cut the four shear
webs from the 3/32" x 3" [2.4 x 76mm] hard balsa
sheet used for the shear webs of the center section.
Glue the shear webs into position where shown on
the plan.
❏ ❏
16. Cut the hatch supports for the ailerons from
the 1/8" x 1/2" x 30" [3.2 x 12.7 x 762mm] basswood
stick. Glue the hatch supports into position, then sand
them even with the bottom of the ribs.
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