Great Planes Giant Extra 330L Kit - GPMA0250 - Manual (Page 34)

❏ ❏ 3. Fit and glue one of each of the die-cut 1/8" ply SF5
and SF6 in position. Note that SF5 aligns with F5, and SF6
is positioned behind and glued to the aft side of the balsa
vertical truss.
❏ ❏ 4. Fit and glue one of each of the die-cut 1/8" ply shell
sub-formers SF3A, SF4A and SF5A in position with the
point aligned with the bottom of the lower center box
longerons. Note that the sub-formers are aligned with the
SF3, SF4 and SF5 formers respectively.
❏ 5. Repeat steps 1 through 4, installing the shell formers
and sub formers to the left fuse side.
❏ 1. Using the same technique as when you made the inner
box longerons, splice and glue eight 1/4" x 1/4" x 36" balsa
sticks in pairs, making four 72" long outer shell stringers.
❏ ❏ 2. Select one of the four outer shell stringers to be used
as the right upper outer shell stringer. Sand a 6-1/2" long
taper onto the stringer and position the tapered end flush
with the upper inner box longeron and aligned with the
leading edge of F9. Position the stringer flush against the
notches in the shell formers and over the plan and glue it in
place. Trim the leading edge flush with SF1.
❏ ❏ 3. Select one of the three remaining outer shell
stringers to be used as the right lower outer shell stringer.
Measure 6" in from one end and make a notch which is 2-
1/2" long (from 6" to 8-1/2") and 1/8" deep.
❏ ❏ 4. Position the stringer flush against F9 and on the
notches along the shell formers and sub formers. Glue the
trailing edge of this stringer flush against the leading edge
Build the Outer Shell Stringers
34