Dynaflite GPMA0090 Butterfly - Manual (Page 14)

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6. Remove the T-pins from rib W-4. Use the
wing tip panel gauge to set W-4 at the correct
angle and glue it to the TE, bottom spar and LE.
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7. One rib at a time, remove the T-pins and use
a building triangle to hold the rib vertical, then use
medium or thin CA to glue the ribs you installed to
the bottom spar, LE and TE.
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8. Install, then glue the remaining ribs to the
assembly using a building triangle to make sure
they are vertical.
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9. Cut, then install the gussets at W-4 from
the 3/16" x 3/4" balsa stick. Due to the taper of
the LE and TE these gussets are not exactly a
90-degree angle.
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10. Add the 1/8" balsa cross-grain shear web
between W-4 and W-5. Use the die-cut 1/8 plywood
wing tip panel gauge to cut the end of the web
that contacts W-4.
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11. Test fi t, then use medium or thick CA to
glue the 1/8" x 3/8" x 30" basswood top outer spar
to the ribs and shear web. Don’t forget to make
sure the crossed T-pins are not in the way and you
can remove them after you permanently glue the
spar into position.
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12. Test fi t, then use medium CA to glue both
1/8" x 1/8" x 30" balsa outer turbulator spars in
the notches of the ribs so the ends extend past
W-4 by approximately 1/16" (you can sand them
fl ush later).
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13. Remove the T-pins, then lift the panel
from the plan. Use a razor saw to cut the ends of
the spars, LE and TE so they extend past W-15 by
approximately 1/32" to 1/16". Use your bar sander
to sand the ends fl ush with W-15 and W-4.
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14. Use a razor plane, a hobby carving blade
or a #11 blade to roughly carve the leading edge
the same way as you carved the inner wing panels.
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15. Glue the 3/4" x 6-1/4" triangle balsa wing
tip to W-15. The aft edge of the wing tip should
align with the aft edge of the TE. It may appear
that the triangle wing tip is too short because it
does not align with the LE, but as indicated on the
plan you will shape the LE to align with the wing tip.