Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 10)

4. Find the 1/8" x 3/8" x 13-3/8" basswood spar
doublers. Sand one end of each spar doubler to a taper
as shown in the " Wing Spar Detail" on the plan. Glue
the spar doublers to the spars, and sand off any excess
glue.
NOTE: Follow steps 9 through 34 to build
the RIGHT wing panel, then repeat these
steps to build the LEFT wing panel.
5. Carefully punch out all the die-cut 3/32" balsa
wing ribs. Sand the edges slightly to remove any die-
cutting irregularities.
NOTE: If you will be installing a retractable
landing gear, disregard Steps 6 and 7.
6. Note that the wing plan shows two alternate
locations for the main landing gear blocks. Note also that
Ribs W-2, W-3 and W-4 have partial cutouts foreach of
the two locations. If you are building your plane as a
taildragger, cut out the front notches in these ribs. If
you are building your plane with a tricycle gear, cut out
the rear notches. (If you will be installing retracts, do not
cut out any of the notches).
7. Glue the die-cut 1/16" ply landing gear dou-
blers to ribs W-2, W-3 and W-4. Be sure to glue them
to the correct side of the ribs, as shown on the plan (make
a right and a left set). Sand the doublers even with the
edge of the ribs.
8. Prepare the leading edge sheeting as follows:
Edge glue the 3/32" x 1/2" x 7-1/2" balsa sheets to the 3/
32" x 3" x 27-1/4" balsa sheets as shown here...
9. Pin one of the spars to the plan with the spar
doubler up and toward the root. NOTE: The spars are
cut slightly too long. Center the spar on the plan so an
equal amount protrudes on both ends.
10. Place the ribs on the spar in their approxi-
mate position, but do not glue. NOTE: Make sure ribs
W-2, W-3 and W-4 are installed with the LG notches
down, and W-l is installed with the servo opening
pointing up.
Now measure and mark the balsa sheeting (see
sketch below), then cut the angle in the sheeting, cutting
along a metal straightedge for accuracy.
CUT FIRST SLOT TO
ANGLE OF DIHEDRAL
GAUGE
NOTCHED LEADING
EDGE
11. Notice that all notches in the LE and TE are
vertical. However, rib W-l will be installed at a slight
angle using the Dihedral Gauge. Therefore, you should
now modify the notch for W-1 by cutting it to the angle
of the rib. You may determine the approximate angle of
the cut by holding the Dihedral Gauge (DG) against the
LE as shown above.
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