Top Flite TOPA0220 - Manual (Page 36)

Note: In the following steps you will build the belly
pan for the wing. Once you tack glue the parts into
position you will remove the wing from the fuselage.
If you are not known for your neat gluing technique,
you may want to put some plan protector or wax
paper between the wing and fuselage to prevent
them from being glued together.
❏ 3. With the wing properly positioned, pin the
leading edge of the wing to the fuselage placing the
pins so they will clear the fuselage sides. Use a tape
measure or string to check that the wing is aligned
properly. To use a string, insert a pin in the aft end of
the fuselage on the centerline. Tie a small loop at
one end of a 36" [914mm] length of string and slip it
over the pin. Fold a piece of masking tape over the
other end of the string and draw an arrow on it. Slide
the tape along the string and align the arrow with one
of the wing tips. Now, swing the string over to the
other wing tip. If the arrow does not align with the tip,
adjust the wing and try again. When the wing is
centered and square with the fuselage, pin the
trailing edge into place so that it cannot shift.
❏ 4. Pin die-cut 1/8" [3.2mm] ply former F2BP to F2
with a 1/32" [0.8mm] spacer between them. A piece
of 1/32" [0.8mm] ply or some cardboard from a
cereal box can be used. You may need to trim F2BP
where it fits to the wing.
❏ 5. In the same manner, Pin F3BP to F3.
❏ 6. Fit the left and right belly pan sides that you
made earlier into place. Make any adjustments
needed for a good fit. Make sure the belly pan sides
are centered in the wing saddle opening. Tack glue
both belly pan sides to the wing with medium CA.
❏ 7. Carefully glue the belly pan sides to F2BP
and F3BP.
❏ 8. Fit and glue die-cut 1/8" [3.2mm] ply former
F2BPD in place 1-5/8" [41.3mm] aft of F2BP. Fit and
glue F3BPD in place 1-5/8" [41.3mm] forward of
F3BP. The bottom of both formers should be even
with the bottom of the belly pan sides.
Note: The photos do not show the flap servo that has
already been installed. If you installed the servo
correctly, F3BPD should be just aft of the servo.
❏ 9. From leftover 1/4" [6.4mm] balsa triangular
sticks, cut and glue filler strips on the bottom of the
belly pan sides.
❏ 10. Remove the wing from the fuselage. Securely
glue all of the belly pan parts to the wing. Sand the
bottom and both ends of the belly pan flat and smooth.
❏
11. Locate the six die-cut 1/8" [3.2mm] ply 1" x 3"
[25.4 x 76mm] wing hold down blocks. Using 6-
minute epoxy, glue them together to form three 1/4"
[6.4mm] thick hold down blocks.
Note: The pin point punch marks should face out on
both sides.
❏ 12. Using 6-minute epoxy, glue the three wing hold
down blocks into place on the belly pan. The ends of
the wing hold down blocks should be even with
F2BPD and F3BPD and the other ends should
extend 1-1/8" [28.6mm] beyond F2BP and F3BP. You
will need to trim the 1/4" [6.4mm] tri balsa between
F2BP and F2BPD.
Note: Position the pin point punch marks as shown
in the photo.
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