Great Planes Ultra Sport 40 Kit - GPMA0410 User Manual
Page 12
web 1/16" behind the spars. Sand one of the 3/32" x 2"
x 2-5/8" balsa horizontal grain webs for a good fit
between W-l and W-2. Using the 1/16" ply dihedral
brace as a temporary spacer, glue the 3/32" web to W-l
and W-2.
the following step and go through a "dry run*
before actually gluing.
20. Glue the die-cut 1/8" ply front web to the
front edge of the spars between ribs W-l and W-2.
NOTE: In the next steps, maintain straightness
by keeping the wing down on the flat surface and
on the TE Jig.
21. Lightly sand the tops of the ribs to blend
with the notched trailing edge; then glue one of the 3/32"
x 1-3/8" x 27-1/4" balsa trailing edge sheets in place.
NOTE: The edge of the TE sheet may not be exactly
straight, but just position the sheet so it slightly overlaps
the TE, and any overlap can be sanded off later.
22. Before applying the leading edge sheeting in
24. Position the leading edge sheeting at the rear
edge of the notched LE so there is an equal amount
protruding on both ends of the wing. Using thin CA, glue
the front (beveled) edge of the leading edge sheeting to
the back edge of the leading edge. Now wet the top
surface of the sheeting so it will bend easier. Apply thick
CA glue to the top edge of the ribs and to the front half
of the spar, then immediately bend the sheeting down
onto the ribs and spar. Hold the sheeting down with
masking tape, pins and your hands until the glue has set.
25. Using the 3/32" x 3" x 8-1/4" balsa sheets,
glue the top center section sheeting in place as shown on
the plan.
the next step, use your T-bar to lightly sand off the edges
of the shear webs and smoothly blend the ribs to the spar.
23. Prepare the 3/32" balsa leading edge sheet -
ing by sanding the front edge to a slight bevel so it will
fit snugly against the back of the leading edge.
NOTE: If you are installing retracts, disregard
steps 26 through 29.
NOTE: It will be helpful to have the following
items handy for the next step... thin CA, thick CA,
a wet cloth, masking tape and T-pins. Read through
26. Remove the wing from the building board
and trial fit the long grooved hardwood LG block into
the notches in dbs W-2, W-3 and W-4 (see the landing
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