Dynaflite GPMA0090 Butterfly - Manual (Page 17)

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13. Glue a piece of 1/8" leftover balsa to rib
W-2 to support the turbulator spars. Trim the ends
of the spars so they are even with the end of the
panel at rib W-4.
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14. Glue the turbulator spars in the left wing
panel the same way.
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15. Use a bar sander and 220-grit sandpaper on
both inner wing panels to carefully remove any glue
blobs and blend all the ribs to the spars, TE and LE.
Join the Outer & Inner Wing Panels
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1. Remove the burrs and chamfer the ends of
the four 1/16" x 5" wing panel joiner wires with
a metal fi le or a powered hand tool and a cut-off
wheel. Remove any oil from the wires left from the
manufacturing process with a cloth dampened with
alcohol or other solvent. Thoroughly roughen the
wires with 150-girt sandpaper so the glue will stick.
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2. Test fi t the right inner wing panel to the
right outer wing panel. If necessary, use your bar
sander to adjust the ends of the spars, LEs or TEs
for a good fi t.
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3. With the mating W-4 ribs contacting each
other and the inner wing panel laying fl at on your
building table, rib W-15 of the outer panel should be
approximately 4" off the table. If necessary, adjust
the ends of the spars at the W-4s to achieve the
approximate 4" measurement.
1/16" Holes
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4. Use a hobby knife or a 1/16" drill to make
two holes in both W-4 ribs to accept the wire wing
panel joiners. Bend, then test fi t the joiner wires.
Adjust the bends so the wires accurately match
the “bend” in the wing and fully contact the spars.
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5. Apply a thin fi lm of epoxy to the W-4 ribs,
then join the two panels with the joiner wires.
Support the tip the same way you did when you
joined the inner panels. Place a sheet of wax paper
under the wing to protect your building board from
excess epoxy, then clamp the W-4 ribs together.
Wipe away excess epoxy before it cures. Do not
apply epoxy to the joiner wires until instructed
to do so.