Top Flite TOPA0101 - Manual (Page 10)

BUILD THE WING
WING CENTER SECTION
NOTE: The center section main spar is made of one
die-cut 1/8" plywood piece sandwiched between two
die-cut 1/16" birch plywood pieces.
NOTE: The wing root ribs are stamped only with a
number (2 is R-2), the wing tip ribs are stamped
with T and a number (T 4 is T-4).
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1. Lightly sand the surfaces of the three pieces
that make up the main spar to make sure they will
lie flat together for a good glue joint.
❏
2. Make some short sticks from leftover 1/8"
balsa to key the rib slots together and assure
proper alignment during gluing. Test fit pieces.
❏
3. Use 30-minute epoxy to glue the spar pieces
together. Use weights to hold them flat on the
table while the glue cures. Apply thin CA on the
edges of the spar,
especially to areas that do not
appear to be well glued.
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4. Clean up the edges of the spar with
sandpaper. If you will be installing retracts, you
may want to cut any holes required for your
retracts in the spar at this time. See the
instructions that came with your retracts.
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5. Join the die-cut 3/16" balsa aft leading edge
pieces at the center over the template provided on
the plan. Use the plan to mark the rib locations on
the aft LE. Glue the die-cut 3/16" balsa
fwd
leading edge pieces to the aft leading edge.
(Center the fwd leading edge on the aft leading
edge as shown on the cross-sectional view.)
Refer
to the photo - do not put glue where indicated.
❏
6. Join the die-cut 3/16" balsa fwd trailing edge
pieces at the center over the template provided on
the plan. Use the plan to mark the rib locations on
the fwd TE. Glue the die-cut 3/16" balsa
aft trailing
edge pieces to the fwd trailing edge. (Center the aft
trailing edge on the fwd trailing edge as shown on
the cross-sectional view.)
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7. The hatched area of the forward LE which was
not glued may be cut loose with a razor saw and
removed after the glue has set on the rest of the part.
❏
8. Drill 3/16" holes through all ribs and doublers
that require them for aileron linkage routing. These
holes are located by punch marks in the ribs just
aft of the spar.
❏
9. Glue the die-cut 1/16" plywood R-2B rib
doublers to the die-cut 3/32" balsa R-2 ribs . Glue
the plywood R-3B rib doublers to the balsa R-3
ribs . Be sure to make a left and a right of each
assembly . Trial fit the R-3 assembly into the spar
slot – you may find it necessary to bevel the
plywood doubler along the top side a little for a
smooth transition.
❏
10. Glue the die-cut 1/8" balsa R-4B sub ribs to
the die-cut 1/8" balsa R-4 ribs . Glue the R-5B sub
ribs to the R-5 ribs . Be sure to make a left and a
right of each assembly .
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