Top Flite TOPA0140 - Manual (Page 28)

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2. Test fit the flap skins to the wing and trim
where needed for a good fit. Bevel the trailing edge
of the flap skins as shown in the sketch below.
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3. Glue the balsa flap skins to your wing.
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4. Proceed to Build the ailerons on page 30.
Perform steps 5 through 26 only if you are
building flaps.
Make the left flap first.
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5. Test fit a die-cut 1/16" [1.6mm] plywood
flap skin on top of the wing. Trim the ends and the
leading edge of the flap skin if necessary for a
good fit. Bevel the trailing edge of the bottom of
the flap skin as shown in the sketch and the photo.
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6. Glue the flap skin to the top of the wing.
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7. Trim the bottom flap skin so it aligns with
the top flap skin when you position it on the wing.
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8. Bevel the top of the bottom flap skin the
same way you beveled the bottom of the top
flap skin.
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9. Use a square to mark the centerlines of
the hinges across the bottom of the flap skin where
shown on the plan.
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10. Tape the flap skin to the wing. Use a
straightedge to extend the hinge centerlines from
the flap to the wing. These lines will help you keep
your drill perpendicular as you drill the holes for
the hinges.
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11. Remove the bottom flap skin and cut the
bottom half of the ribs along the lines you marked
earlier. Remove the bottom portion of the ribs (
see
the following photo).
In order for your flaps to operate correctly and
have the best fit and appearance, the holes for
the hinges in the wing and in the flap (and
therefore the hinges themselves) must: 1) be
perpendicular to the flap LE and inner TE and
2) accurately align with each other. Follow the
instructions closely and work as accurately as
you can to achieve this.
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