9
the airfoil is toward the building board and the ribs are fully
seated on the spar. Use a small drafting triangle to hold each
rib vertical while you glue it in position. NOTE: The main spar
is centered in the spar notch in the R1 rib to allow room for
the spar joiners to fit on both sides of the spars.
❍ ❍ 5. Cut two 24" trailing edge sticks from 1/4" x 3/8" x 30"
balsa. Glue the trailing edge (3/8" dimension is vertical) to the
ribs and bottom trailing edge sheeting. Sand the top of the
trailing edge (with a long sanding block) flush with the top of
the ribs at an angle that matches the slope of the airfoil.
❍ ❍ 6. Cut two 24" sub leading edges from the 1/16" x 1" x
30" balsa sheets. Center the sub leading edge vertically on
the front of the ribs (and flush with the wing’s centerline),
then glue it in position. Sand the top edge flush with the top
of the airfoil.
❍ ❍ 7. Cut two 5/16" x 1-3/16" x 30" balsa leading edges to
24". Vertically center, then glue, a leading edge to the sub
leading edge of the wing panel.
❍ ❍ 8. Glue the 1/4" x 1/4" x 24" top basswood spar in
position. Use a drafting triangle to be sure the root end is
even with the bottom spar.
❍ ❍ 9. Use the leftover 1/4" basswood spar material to make
two aileron servo rails 1-5/8" long. Insert two of the rails into
the notches between the closely spaced R2 ribs. Use a servo
of your choice to set the correct spacing between the rails,
then glue the rails securely in position.
❍ 10. Follow steps 2 - 9 to build the second wing panel using
the extra pieces you cut previously. Be sure to build a left and
right wing panel.
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