Great Planes Giant Extra 330L Kit - GPMA0250 - Manual (Page 36)

❏ ❏ 7. Slide the wing tube through from the left side of the
fuse until it is pushing lightly on the side sheet you just
installed. Working a little at a time, cut an opening in the
sheeting for the wing tube. NOTE: The size and position of
this hole is not critical front-to-back, but there is only 1/4" of
wing above the tube, so be very careful with how high you
cut the sheeting.
❏ ❏ 8. Slide in the aft anti-rotation dowel and trim the
sheeting as you did for the wing tube.
❏ ❏ 9. Remove the anti-rotation dowel and wing tube.
❏ 10. Repeat steps 1-9, sheeting the right side of the fuse.
❏ ❏ 11. Turn the fuselage right-side-up on your work surface.
Use a razor plane to shape the right side upper center box
stringer just as you did the lower center box stringer.
❏ ❏ 12. Glue a 3/32" x 3" x 36" outer shell upper sheet to
the center longeron and the lower sheet, making sure to
leave at least 1/4" of balsa extending behind the trailing
edge of the upper end of SF7.
❏ ❏ 13. Use a straightedge to continue the angle on the
trailing edge of the sheeting from the lower sheet onto this
upper sheet.
❏ ❏ 14. Glue the upper sheet to the formers and the upper
stringer. Trim the sheet flush with the top of the upper
stringer and the leading edge of SF1.
❏ 15. Repeat steps 11 to 14, installing the upper sheeting
on the left side.
❏ 16. Cut two 3/32" x 1/4" x 36" balsa sticks into six 12"
fuse side shapers. Cut an angle on each one to match the
angle of the side sheeting when positioned lengthwise so it
is 3/32" wide and 1/4" tall. Position and glue each shaper
along the outer shell stringers (3 on each side) and flush
against the fuse outer shell sheeting.
❏ 17. Gradually taper each shaper from the sheeting into
the outer shell stringers. HINT: A razor plane does this task
exceptionally well. If you’ve never used a razor plane, do
yourself a favor and buy or borrow a razor plane for this
task. This one task alone will very likely show you just how
invaluable this tool is.
❏ 18. Read the following expert tip then cut out both wing
openings in the sheeting as shown in the photo.
A simple tool made from some leftover basswood and a
single-edge razor blade can really help make this task
easier. Glue a piece of leftover 1/8" x 1/4" basswood (at
least 4", ideally about 6" in length) to one side of a single-
edge razor blade, standing up vertically. You can now hold
the bass stick along the wing and slide the razor through
the sheeting along the edge of the wing without risking
cutting the wing.
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