Top Flite TOPA0150 - Manual (Page 39)

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9. Test fit the flap to the wing. With the flap
resting in position, sand the 1/8" x 3/16" balsa strip
glued to the underside of the top flap skin even with
the bottom flap skin. Make other adjustments where
necessary for a good fit. Temporarily hold the flap
skin to the wing with a strip of masking tape while
you build the other flap.
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10. Return to step 1 and build the other flap the
same way.
Hinge the flaps
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1. Use a straightedge and a ballpoint pen to
lightly mark lines on the bottom wing sheeting,
noting the location and alignment of the hinges. The
lines should be perpendicular to the flap LE and the
wing TE and centered over the hinge blocks.
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2. Using the lines you marked on the bottom of
the wing as an alignment cue, drill 7/64" holes in the
outer TE spar 1/8" above the bottom of the wing for
Great Planes small Pivot Point Hinges GPMQ4001
(not included). It’s okay to angle the drill slightly to
clear the top flap skin, as long as the opening of the
holes remain 1/8" above the bottom of the wing.
Hint: Use a piece of leftover 1/8" balsa as a gauge
to align the drill.
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3. Drill 7/64" holes through the LE of the flap the
same way. Use the 1/8" balsa gauge to make sure
the holes are correctly aligned.
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4. Enlarge the openings of the holes to
accommodate the hinge pins, thus allowing the
hinges to be inserted half-way in both the flap and
the wing.
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5. Test fit the flap to the wing with the hinges.
Make certain all the hinges go in all the way. Make
adjustments if necessary.
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6. Use a straightedge and a ballpoint pen to
lightly draw a line across the bottom of the flap 1/4"
from the leading edge. Use a razor plane, followed by
a bar sander with 80-grit sandpaper, to bevel the flap
from the center of the LE up to the line you drew.
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7. Reposition the flap to the wing with the
hinges. Make certain you can get 1-11/16" of control
throw as described in the back of the manual.
Increase the angle of the bevel if necessary.
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8. Drill the holes for the hinges and fit the other
flap to the wing the same way.
Finish building the ailerons
We’ll show you the right aileron first.
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1. Sand the top and bottom aileron sheeting
and the aileron tip even with the aileron spar. Cut the
aileron LE from the 1/4" x 3/4" x 30" balsa stick.
Glue the aileron LE to the aileron.
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2. Shape the top and bottom of the LE even
with the top and bottom of the aileron.
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