Use the marks at the tip made in an earlier sequence as a guide at the tip for marking
the edges of the ½ inch cutout. Make a mark on the top and bottom skin in the center
of these two marks.
Measure down the trailing edge of the wing from the tip 35.5 inches and make a
mark. Then measure this mark from the center of the wing and make another mark the
same distance from the center but 5.25 inches up on the wing.
Now connect these two marks in a vertical line. This will be the separation line for
the flap root and should be parallel with the center of the wing.
Measure up on this line 5 and ¼ inches and make a mark Now connect this mark with
the one you made at the tip, this will be in the center of the ½ cutout.
Repeat top and bottom for both wings.
Cut through the balsa sheet with an Exacto knife along the entire length of these
separation lines, thereby removing the aileron and flap as a single unit. DO NOT cut
them apart yet.
Now you can see the foam underneath at the TE of the wing and LE of the flap and
aileron assembly.
Using the foam as a guide, carefully cut away all of the balsa and make flush with the
foam. Be careful not to sand into the foam and disturb the alignment of the flight
surfaces.
Using the ¼ x 3 x 36 balsa stock cut tapered pieces to fit to the TE of the wing and
LE of the aileron and flap piece, but still do not cut apart the aileron and flap as yet.
Use Pacer’s Zap PT-25 or your preferred method to secure balsa to foam in the
following steps.
Glue the ¼ inch tapered sheet balsa pieces into place on the wing TE and Aileron/flap
LE and sand flush and smooth with the surface of the wing sheeting and at the ends.
Place the aileron/flap assembly into position in the wing cutout and ensure it goes
back just as it was cut away, if you followed the instructions, this will happen
automatically.
You may need to “clean up” the root edge of the flap where it meets the wing and
remove approximately 1/8 of an inch of material from the wing AND from the Flap to
allow for the following step.
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