Great Planes T-Craft 20 Kit - GPMA0155 User Manual

Page 12

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6. Cut a V-notch part way through the spar, at the mark,

so that the spar can bend at W-4.

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7. From one of the 1/16" x 3" x 30" balsa sheets, cut four

1/2" x 3/4" shims. Place the shims over the spar location on
the plan, starting between ribs W-2 and W-3 and alternating
every other rib bay. Pin the main spar, cut in step 6, over the
shims, aligned with the wing plan at the wing root.

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8. Glue two of the die-cut 3/32" balsa W-4 ribs together

to make the W-4 outer rib.

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9. Glue the die-cut 1/16" ply W-2 spar spacer to the tip

side of rib W-2, centered between the main spar notches
and the lightening holes. Trim the main spar notches for the
1/16" plywood wing joiner.

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10. Pin and glue the die-cut 3/32" balsa W-2, W-3, W-4

and W-6 ribs and the die-cut 1/8" balsa W-5 rib onto the
main spar, perpendicular to the building board. Note: There
is a W-3 and W-4 rib glued together at the root of the aileron
bay. The main spar will need to be bent upward to contact
the W-6 rib.

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11. Position the 1/8" to 11/32" x 3/4" x 18" shaped balsa

trailing edge on the jig tabs of the W-2 and W-3 ribs, flush
with the outside of rib W-3. Use a straight edge to align the
top of the TE with the top of the ribs. When satisfied with the
fit, glue the TE to the ribs. Note: The TE extends 1/16" above
rib W-2 to allow for the 1/16" center sheeting.

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12. Fit and glue the 1/4" x 1/4" x 30" balsa sub TE in

the notches at the rear of the W-4 and W-5 ribs. Butt glue the
sub TE to rib W-6.

1/8" X 1/4" MAIN SPAR