Great Planes Spirit 100 Sailplane Kit - GPMA0550 - Manual (Page 21)

D D 3. Glue one of the "Inner Bottom" wing sheets to the
edge of a 1/8" x 3/8" x 30" Basswood Inner Spar (SPT1W12)
using the following procedure. With the spar in position on the
plan, hold the straight edge of the bottom wing sheet up against
it. Starting about 9 inches from the "root" end (where the first W2
rib will be positioned), add thin CA along the joint. Be sure to
hold both the spar and the bottom wing sheet flat against the work
surface while the glue cures. Glue a 5" - 6" section at a time until
you get within 4" of the other end (where the last W2 rib will be
installed). Do not glue the two ends yet as some of the sheeting
will be cut away later.
D D 4. Align the bottom spar/wing sheet assembly with the
"Inner Panel" drawing on the wing plan and pin it in place. This
assembly will be a little long but just center it over the inner panel
drawing.
D D 5. Pin one of the Notched Balsa Inner Sub Trailing
edges (SPTW18) to the plan, lining up the notches in the sub TE
with the notches on the plan. Use a couple of W2 ribs to correctly
space the sub TE behind the spar. If the notches are off a little
from the plan it is due to the moisture content of the air. Just line
up the root end of the sub TE and space the ribs according to the
sub TE, not the plans.
DD 6. Place the eight W-2 ribs (SPT1W05) on the spar in
their approximate positions. Work the ribs into the notches on the
trailing edge but do not glue anything yet.
DD 7. Make sure the ribs are properly positioned according
to the plans and glue them to the spar using med. or thick CA. Do
not purposely glue the ribs to the sheeting yet. Use the square
end of the rib gauge to keep the ribs perpendicular to the work
surface. Hold the sub TE and the first W2 rib flat against the plan
and with the rib inserted fully into the notch, add a drop of thin CA
to the joint. Do the same to the rest of the W2 ribs.
D D 8. Trial fit the Top 1/8" x 3/8" x 30" Basswood Inner
Spar (SPT1W12) into the notches in the ribs by carefully pushing
the spar completely down into the notches. Make sure the top
spar is lined up lengthwise with the bottom spar. Remove the spar
and apply med. or thick CA to the notches. Replace the spar and
make sure the spar is level with the front half of the rib so the
sheeting will lie flat on the spar.
DD 9. Position a 1/8" x 3/8" x 23-1/2" Basswood Outer
Spar (SPT1W13) under the front edge of the leading edge sheet
to hold it up against the front of the rib. Use weights or pins near
the spar to hold the panel flat on the work surface during this step.
Apply thin CA to glue the sheeting to the ribs. The outer spar is
shorter than the panel so you will have to do approx. half the ribs
then move the spar down to do the rest of the ribs.
D D 10. Unpin the wing panel from the work surface and hold
a metal straight edge against the front of the ribs. Allow the panel
to tip up so the front edge of the sheeting is flat on the work surface
and use an Xacto knife to carefully cut the sheeting off flush with
the front edge of the ribs. Use a sanding block to remove any
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