Top Flite Sierra 40 Trainer Kit - Manual (Page 18)

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15. With the panel held flat on the table, use
medium CA to glue in the pre-cut 1/16" x 1-1/2" x2"
balsa shear webs between the R-3 Ribs. Refer to
the plans. Notice there are shear webs on both
sides of the spars outside the first two R-3 ribs and
only behind the spars between the remainder of
the R-3's.
NOTE: The function of the shear webs is to keep
the spars from collapsing. They will not and need
not touch or be glued to the ribs. They should be
thoroughly glued to the spars.
16. Make sure the wing panel is still lined up
properly over the plan.
17. Position the 4 deg. side of the guide tool
exactly where the end of the bottom spar is shown on
the plans. Use a pen to mark an angled line on the
top and bottom spars.
18. Use the guide tool to mark angled lines on
the leading and trailing edges from where their
bottom ends are shown on the plans.
19. Use a razor saw to cut off the spars and the
leading and trailing edges at the marked angles. A
T-bar is used to "clean up" the angled ends of the
spars, leading edges, and trailing edges.
20. Use a razor saw and a T-bar to trim the tip
ends of the spars and leading and trailing edges
flush with the outermost R-3 rib.
If you are building the 3-channel wing (without
functioning ailerons), follow the instructions in
the shaded box. If you are building the 4-channel
wing, skip to step 24.
NOTE: The LEFT WING PANEL plan and its
cross-sectional view show the "no aileron"
version.