Dynaflite GPMA0090 Butterfly - Manual (Page 16)

16
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7. Carefully lift the wing from your building board
so you do not break the spot-glued joints, then place
it on the leading edges. Mix a batch of 30-minute
epoxy, then thoroughly glue the joiner tubes to the
shear webs, spars and ribs.
Do not disturb the
wing until the epoxy cures.
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8. Remove the clamps and separate the wing
panels. Make the top center section sheeting for
both wing panels from the remainder of the 1/16"
x 3" balsa sheet. Test fi t the sheets and confi rm
that the front and rear edges are fl ush with the TE,
upper spar and LE. If needed, trim the tops of the
ribs. Bevel the front edge of the front sheet so it
matches the LE, then glue the sheets in position.
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9. Use a hobby knife and your bar sander with
150-grit sandpaper to trim the edge of the sheet
so it is even with W-1. Do not trim the ends of the
joiner tubes so they are fl ush with W-1.
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10. Cut both of the TEs as shown on the plan.
Cut the 1/8" x 4" hardwood dowel into two pieces,
then test fi t and glue the dowels to the TEs of both
wing panels with medium CA. Use your bar sander
to true the end of the dowels so they are fl ush with
the ends of the wing.
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11. Test fi t the die-cut 1/16" plywood W-1 root
ribs on the ends of the wing panels and the joiner
tubes. Then, glue them in position with medium
or thick CA. If you’ve just removed the W-1’s from
their die sheet, remember to save the leftover 1/16"
plywood to be used later during fi nal landing gear
installation.
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12. Test fi t the 1/8" x 1/8" x 18" basswood
turbulator spars in the notches of the right wing
panel. The ends of the spars contact the center
sheeting and the tops of the spars are even with
the sheeting as shown in the following photo. If
necessary, adjust the notches so the spars fi t
fl ush with the tops of the ribs, then glue the spars
in position with thin or medium CA.