Dynaflite PT-19 - Manual (Page 21)

8. Align the wing squarely on the fuselage. This is
easily done using a piece of string as a guide. Put a pin
in the tail of the fuselage on the centerline. Tie a loop in
the end of the string and place it over the pin. Move the
other end of the string to one wing tip and put some
masking tape around the string. Draw an arrow on the
tape where it reaches the wing tip. Now swing the
string over to the other wing tip. If the tip aligns with the
arrow the wing is properly aligned. If not, adjust the
wing's position and try again. Continue to adjust the
wing until both wing tips are aligned with the arrow on
the tape. Secure the wing exactly in this position.
9. Drill two pilot holes for the 1/4-20 wing bolts
using a 13/64" bit. Drill the holes through the wing
and into the ply wing bolt plate so that the holes will
be centered fore/aft in the plate.
10. Remove the wing from the fuselage. Tap the
holes in the ply plate for the bolts with a 1 /4-20 tap.
Apply a couple of drops of thin CA to the threads to
harden them. After the CA has cured, run the tap
through the threads to clean them up.
12. Enlarge the wing bolt holes in only the wing
with a 1/4" drill, drilling through the 1/16" ply
plates as well.
13. Put some wax paper on the center of the
wing where it will touch the fuselage and bolt the
wing to the fuselage with the 1 /4-20 nylon bolts.
14. Fit a laminated wing saddle (that you built in
step one) to each side of the fuselage. Sand it
carefully so that it fits the top surface of the wing.
When satisfied with the fit, glue each to the fuselage
side with 30-minute epoxy. Do not use 6-minute
epoxy as it will not allow you enough time to
position the clamps.
15. While you are waiting for the epoxy to cure,
make two more wing LE skins just as you did in step
2 of "BUILD THE WING."
16. Using leftover 1/4" x 1/2" balsa, glue a
fairing strip to the fuselage at the rear of the wing
saddle. This piece can be seen in the photo at step
22 on page 22.
11. Fit the two 1/16" ply reinforcement plates for
the wing bolt holes into the wing. Glue these into
position over the holes with 6-minute epoxy.
17. When the epoxy has cured, remove the wing
from the fuselage. Sheet the bottom LE of both
wing panels.
21