Top Flite TOPA0160 - Manual (Page 25)

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23. Mark the locations of the aileron hinge slots
on the outer wing TE and the aileron LE, so you will
know where to cut the hinge slots after the wing and
aileron are sheeted. Mark the location of the flap
hinge blocks the same way.
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24. Return to step 1 on page 22 and finish the left
wing panel.
BUILD THE CENTER SECTION
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1. Position the center section wing plan (which is
attached to the right wing plan) over your building
board and cover the plan with Plan Protector or
waxed paper.
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2. Prepare two W1 ribs as follows: Use thick or
medium CA to glue two die-cut 1/8” [3.2mm] plywood
dowel rib doublers W1D and one bolt plate rib
doubler W1P to the sides of each die-cut 1/8”
[3.2mm] balsa ribs W1 as shown on the plan. Pay
careful attention to which sides of the ribs the
doublers are glued.
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3. Prepare two additional W1 ribs as follows: Use
thick or medium CA to glue one die-cut 1/8” [3.2mm]
plywood bolt plate rib doubler W1P to the sides of
each die-cut 1/8” [3.2mm] balsa ribs W1 as shown
on the plan. Pay careful attention to which sides of
the ribs the doublers are glued.
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4. Glue two sets of die-cut 1/8” [3.2mm] plywood
wing bolt plates together to make two 1/4”
[6.4mm] plates.
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5. Glue the die-cut 1/8” [3.2mm] plywood leading
edge doubler (W21) to the die-cut 1/8” [3.2mm]
plywood center leading edge (W21A) so the
bottoms of the notches align. W21A is narrower
than W21 so the top and bottom edges will be offset
1/16” [1.6mm].
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6. Test fit the wing bolt plate in the notches of the
ribs where shown on the plan. Adjust the notches if
necessary so the bolt plates fit.
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7. Remove the balsa from both W1 ribs between
the notches of the dowel doublers.
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8. With a straightedge and a ballpoint pen mark
two vertical lines 1/16” [1.6mm] ahead of and behind
the spar notches on the outside of both of the W1
ribs, that have only the W1P doublers glued to them.
Use a sharp hobby knife to cut halfway through the
balsa along the lines. This section of balsa will be
removed to accommodate the spar joiners when it is
time to join the wing.
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9. Cut one 11” [279mm] long piece for the bottom
center spar and one 9-1/4” [235mm] long piece for
the top center spar from a 1/4” x 3/8” x 24” [6.4 x 9.6
x 610mm] basswood stick. Pin only the ends of the
11” bottom center spar to your building board over its
location on the plan. Do not stick the T-pins through
the basswood spar but insert them in a crossed
fashion over the spar to hold it to your building board.
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