GREAT PLANES Ultra Sport 40 Plus, Instruction Manual

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30. Flip the wing over again to work on the top side.
Locate a 1/16" x 3/4" x 30" [1.6mm x 19mm x 760mm] balsa
stick. Glue the stick flush with the wing trailing edge (TE)
with medium CA. Cut the ends of the stick that extend past
the wing tip and wing root.
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31. Glue together two pieces of 1/16" x 3" x 30"
[1.6mm x 76mm x 760mm] soft balsa used to sheet the tail
surfaces in a previous step. Sand the joint smooth. Mark one
end of the sheet 2-3/4" [70mm] away from the long edge.
Mark the other end of the sheet 4-1/2" [114.5mm] away from
the long edge. Make a straight line through these two marks
and use a straight edge to cut along the line. One of the cut
parts of this sheet will be used to sheet the leading edge of
the wing. The other part will be used to sheet part of the
center-section of the wing and for cap stripping the wing.
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32. Sand the top of the wing smooth with a long
sanding bar. Glue the sheeting to the main wing spar and to
the ribs and sub-leading edge as shown with medium CA.
Note that the sheeting starts centered on the main wing
spar. If you prefer to use a slower curing glue, place weights
on the sheeting to keep it attached to the wing ribs as the
glue cures.
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33. Once the glue has cured, flip the wing over and
add more glue if necessary to attach the sheeting to the ribs
or sub-leading edge.
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34. Cut the portion of the sheet that extends past the
root and the tip.
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35. Locate a 1/16" x 3" x 30" [1.6mm x 76mm x 760mm]
balsa sheet and cut four pieces 4-3/4" [121mm] long from it.
Glue one of the parts to the wing center-section. Use some
of the leftover sheeting cut in step 31 to complete the
center-section sheeting.
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