Great Planes F4 Phantom - GPMA0440 - Manual (Page 34)

die-cut 1/8" plywood belly pan former D-4 away from
former F-6. Draw a centerline on D-4 and on the plywood
wing bolt plate. Glue D-4 to the wing bolt plate.
1. Use a leftover piece of 1/16" balsa sheet to space the
6. Glue 1/2" balsa triangle sticks between D-1 and D-4,
flush with the top of the belly pan sides. The triangles will
need to be trimmed to fit against the wing bottom, between
D-1 and D-2. Use a long bar sander to sand the belly pan
sides, formers and triangles flat.
7. Glue 1/8" x 24" basswood stringers in the notches
from D-1 to D-4.
2. Follow the same procedure to install the die-cut 1/8"
plywood belly pan former D-1 to the LE of the wing. You
may need to sand the bottom of the former for a good fit
against the wing. The top of the former must be 1/16" to
3/32" below the top of former F-3.
3. Use a straightedge to draw lines from the edge of D-1
to D-4.
8. Cut and glue a 3/32" x 3" x 24" balsa sheet on the
center of the belly pan formers and stringers.
9. Make sure the wing bolts are removed before gluing a
4. Glue the die-cut 3/16" balsa belly pan sides to the
bottom wing sheeting and formers D-1 and D-4. Use the
line between the formers as a guide.
5. Draw two lines 1" and 7-1/4" forward of D-4. Place the
die-cut 1/8" plywood belly pan former D-2 on the
7-1/4" line and the die-cut 1/8" plywood belly pan former
D-3 on the 1" line. Place a straightedge on top of the
formers. Sand the bottom of D-2 and D-3 so that they fit
tightly against the wing sheeting and are flush with the
bottom of the straightedge. When satisfied with the fit, glue
the formers in place.
3/32" x 3" x 24 balsa sheet on each side of the center sheet.
Note: The sheeting at the front will not cover the triangle
sticks completely.
10. Sand the 1/2" triangle and 3/32" balsa sheeting flush
with the sides of D-1 and D-4.
11. Turn the wing over and place a block of wood under
the belly pan in the area of the wing bolt holes. Use the
wing bolt holes as a guide to drill 1/4" holes through the
belly pan. The block under the belly pan will prevent the
wood from splitting
34