Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 18)

D D 6. Temporarily remove the wing from your building
board. Glue the 3/16" x 1/4" x 40" basswood bottom
forward spar in the notches in the ribs. There is no need
to need to remove the 2" from this spar.
Replace the wing on the flat building surface and pin it to
the board.
D D 9. Add ten (nine for the clipped wing version) 3/32" x
3-1/2" x 1-9/16" pre-cut vertical grain balsa forward shear
webs to the rear of the forward spars between each rib
bay. The shear web between R7/R7B and R7 will have to
be shortened to clear the strut block.
D D 10. Locate the die-cut 1/8" plywood dihedral gauge.
Hold the gauge next to the main spar with the corner of the
gauge at the dashed centerline on the plan. Mark both
sides of the main spar along the front edge of the gauge.
D D 7. Mark the center of the 3/8" x 3/4" x 3/4" basswood
wing strut blocks. Drill a hole in the center of each block
with a 1/8" drill bit. Glue the block to ribs R7 & R7B where
shown on the plan, with the grain running parallel with the
spars.
D D 8. Cut the 2" piece of the basswood top forward spar
from step 3 into two 1" long pieces. Use 30-minute epoxy
to glue the strut blocks into position with the grain direction
parallel with the spars. A 1" basswood "gusset" is also
glued to the side of the rib doubler R7B and to the top of
each block.
D D 11. Connect both lines by drawing a line across the
top of each spar.
D D 12. Follow the same procedure as steps 10 and 11
to mark the forward spars.
D D 13. With the wing panel still pinned to the plan,
transfer the wing's centerline from the plan onto the bottom
sheet and the notched trailing edge.
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