spars and the die-cut 1/8" plywood forward joiner in the
right wing. Slide the right wing half with the joiners into the
left wing half, checking the fit. The main spars, forward spars
and TE on both wing halves should meet. Make sure the left
wing half is positioned on the tip crutch and the right wing
half is flat against your building board. Sight down the wing
from the wing tip, checking that the main spar, sub LE and
TE are straight. If they are not, lightly sand the ends of the
spars or TE to achieve a straight wing. Caution: Remove
only a small amount at a time. You can always remove more
wood, but cannot add more wood once it’s removed.
❏
7. When satisfied with the fit of the wing halves, remove
the joiners. Use 30-minute epoxy to glue the two wing
halves together. Apply epoxy to the top and bottom of the
center wing joiners, the front and back sides of the main
spars, the front of the forward spars, the ends of the forward
joiner and the TE's. Slide everything back together. Wipe off
any excess epoxy with a paper towel dampened with
rubbing alcohol. Check that the tip crutch is in position, the
right wing panel is flat against your building board and the
main spar is straight. Use clamps to hold the joiners in
position until the epoxy cures.
❏
8. Glue together the two die-cut 1/8" plywood ribs W-1A
and the two die-cut 3/32" balsa ribs W-1B.
❏
9. Use epoxy to glue the W-1A ribs to the forward spars
and forward joiner, centered on the ply wing joiner. Glue
W-1B, centered on the ply wing joiner and the TE.
❏
10. Glue shear webs to the aft side of the ply wing joiner
between ribs W-2 and W-3.
❏
11. Sand the balsa sub LE flush with the top of the ribs.
❏
12. Support one wing panel with the wing tip crutch and
weight the other panel flat on your building board. On the
weighted panel, fit a 1/16" x 3” x 30” balsa sheet in place,
against the notch in the ribs and on top of the main spar and
over one of the W-1A ribs. Glue the balsa sheet to the main
spar and notches. When the glue has cured, apply a bead
of glue to the top of each rib, along the sub LE and forward
spar and joiner. Pull the sheeting down, making sure it
contacts the surface of each rib, sub LE and forward spar
and joiner. Hold it in place until the glue has cured.
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