Great Planes Spectra Electric Sailplane Kit - GPMA0540 - Manual (Page 13)

DD 22. Punch out three W1A ribs and three W1B ribs
from the 1/8" die-cut balsa rib sheet (SPRTW01). Test fit
these ribs into position. A little sanding may be necessary to
make them fit properly. Glue these ribs into place using thick
CA. The end rib should be tilted in at the top using the slanted
end of the rib gauge to give it the correct angle.
DD 23. Cut and sand the leading edges, trailing edges and
spars to their correct length.
BUILD THE OUTER WING PANEL
You'll need the following parts:
SPRTW03 1/16" Die-Cut Balsa Wing Ribs W4 - W10
SPRTW07 1/16" Die-Cut Balsa Shear Webs
SPRTW10 Shaped Balsa Leading Edge
SPRTW 12 Shaped, Notched Balsa Outer Trailing Edge
SPRTW14 1/8" x 5/16" x 15-1/8" Basswood Outer Spars
SPRTW15 7/8" Shaped Balsa Wing Tip Block
DD 1. Lay one of the Outer Trailing Edges (SPRTW12)
in place over the plan. Align the notches in the trailing edge
with the notches on the plans and pin it in position. NOTE:
The un-notched end of this trailing edge is not used and
goes out toward the tip of the panel. Cut the extra trailing
edge off 1/4" past the last notch.
DD 2. "Cross pin" one of the 1/8" x 5/16" x 15-1/8"
Basswood Outer Spars (SPRTW14) in place.
DD 3. Punch out the 1/16" (W4-W10) Tip Ribs out of
one of the SPRTW03 die-cut sheets. Glue the ribs in place
with a thick CA at the spar joint and a drop of thin CA at the
trailing edge joint. Use the rib gauge to keep the ribs
perpendicular.
DD 4. Trial fit the top 1/8" x 5/16" x 15-1/8" Basswood
Outer Spar in place by carefully pressing the spar into the
notches until it is flush with the top of the ribs. Remove the
spar and apply thick CA to the notches. Replace the spar and
allow the glue to cure.
DD 5. Lay one of the remaining Pre-Shaped Leading
Edges over the LEADING EDGE TEMPLATE at the top
right comer of the plans. Use this drawing as a reference to
cut the leading edge to length and to cut the relief notches. It
is a good idea to cut the leading edge approximately 1/4"
longer on both ends to be on the safe side. It can be cut to
the correct length after it is installed. The relief notches do
not need to go all the way through the leading edge but should
go within 1/8" of doing so. NOTE: you need to make a
"right" and a "left" LE.
DD 6. Carefully bend the leading edge to the angle
shown on the plans and position it against the ribs. The bends
should be at ribs W6 and W9. Align the leading edge with the
ribs and glue it in place just as you did for the inner panel
except start at ribs W6 and W9. Also note that there is no
sheeting on the outer panel so the ribs are the full height of the
LE.
DD 7. Punch out the remaining 6 shear webs (from
SPRTW07) and lay them end to end so that the end of one web
is the same size as the end of the one next to it as shown in the
sketch below. This is the order and direction they will be
installed in the wing. The shortest web goes between ribs W9
& W10 and the longest web goes between ribs W4 & W5.
NOTE: These webs are actually tapered to match the
taper of the wing. There is a sketch at the top of the next page
to illistrate this taper.
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