Dynaflite DYFA2016 - Manual (Page 17)

1/8" X 3/8" BASSWOOD SPAR
Q 8. Pin a 1/8" x 3/8" x 30" basswood bottom
spar over its location on the plan. Do not attempt to
insert the T-pins through the spar (basswood can be
pretty hard stuff). Insert them over the spar in a
criss-cross fashion as shown.
Q 9. Pin one of the 1/16" x 1-3/8" x 30" balsa
trailing edge sheets over its location on the plan.
Q 10. Mark the bottom main spar and the bottom
TE where the three #1 ribs contact them.
Q 11. Make the aft bottom center section sheeting
from the 1/16" x 3" x 24" balsa sheet. Glue it to the
bottom spar and bottom TE sheeting.
Q 12. Cut 1/4" strips from leftover 1/16" balsa
sheet to fit under the outer #1 ribs ahead of the
bottom spar. Place the strips over their location on
the plan but do not glue them to the ribs. These are
just shims to temporarily align the ribs while you
build the wing.
U 13. Glue the outer #1 ribs (with the holes you
made) on top of the 1/16" aft bottom center section
wing sheeting with medium CA. Use a small 90
degree triangle to hold the ribs vertical as you apply
the glue.
1/16" VERTICAL GRAIN
SHEAR WEB
BOTTOM TE 1/4" STRIP CUT FROM
1/16" LEFTOVER BALSA
Q 14. Use the same 1/16" x 3" balsa sheet you
used for the aft bottom center section sheeting to
make a vertical grain shear web to fit between the
#1 ribs. The web should be centered on the spar and
extend from the bottom spar to the bottom of the
notches in the ribs.
Q 15. Cut the remaining #1 rib in the middle of
the top and bottom spar notches. Discard the
front piece.
Q 16. Test fit the aft piece of rib #1 on the center
section sheeting at the marks you made that indicate
its location. If necessary, trim the front of the rib so it
joins the center web and its notches align with the
other #1 ribs (you will probably have to trim about
1 /32" off the front of the rib).
17. Glue the center rib #1 in position with
medium CA.
RIB NO. 1
1/16" AFT
BOTTOM SHEETING
17