Great Planes F-15 Eagle 40 Kit - GPMA0438 - Manual (Page 36)

D 10. Sheet the opposite wing panel using the
same procedure outlined above.
INSTALL THE BOTTOM WING
SHEETING
D 1. Flip the wing over and carefully trim off the
jig tabs on the bottom of the wing (the side
opposite of the side you just sheeted). Also trim
the shear webs flush with the spar and cut the
bottom spar off flush with rib 10. Use a sanding
block with fine grit sandpaper to touch up where
the jig-tabs were and to blend the ribs into the TE.
Be careful not to change the shape of the ribs
during this step.
D 2. Install the 1/16" x 2-15/16" x 1" balsa
center spar shear webs (F154W19) by securely
gluing them to the top center spar in all the rib
bays. Cut them to fit when required and make
sure they are in full contact with the spar. Notice
that they are glued to the bottom of the spar
and not the front or back.
D 3. Cut the remaining 1/8" x 1/4" x 30"
basswood center spar (F154W09) to fit as you did
earlier on the top surface. Apply a bead of thick
CA on the top surface of all the center spar shear
webs and install the center spar. Make sure all the
jig-tabs are on the work surface and the center
spar is pressed down against the shear webs.
NOTE: The spar need not be flush with the bottom
edge of the ribs. Make a glue fillet around the
center spar where it contacts the main spars. After
the glue is fully cured, remove the wing from the
work surface and inspect the shear web joints.
Add medium CA to the joints if necessary to
achieve good strong joints. Replace the wing on
the work surface.
D 4. Add the remaining two 1/16" x 7/8" x 18"
balsa TE sheets (F154W15) just as you did earlier
on the top surface. Do one panel at a time and
keep the wing flat on the work surface until the
glue cures.
D 5. Sand the area near where the main spars
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