Great Planes Ultimate Biplane 40 Kit - GPMA0240 - Manual (Page 32)

D 7. Make the wing tips from leftover 1/8" x 3" x 18" balsa
sheet. Hold the sheet against tip rib R-1 and draw an
outline of the rib. Cut and glue the wing tips to tip ribs R-1.
D 8. Drill a 5/32" hole through the bottom sheeting using
the hole through ribs R-8 and R-9 as a guide.
D 14. Finish sand the strut with 320-grit sandpaper. Glue
the strut brace along the centerline of the strut from base
line to base line. Install the strut braces on both sides of
each strut.
D 9. Enlarge the holes to 5/8" wide by 3/4" long in the bottom
sheeting only. Leftover balsa can be inserted under the
bottom sheeting around the two holes to support the sheeting.
D 10. Test fit the top wing on the fuselage. The holes in the
bottom sheeting may need to be enlarged to allow the
cabane to seat on the bolt plates.
D 11. Measure the distance between the top and bottom
wings next to the fuse and at the wing tips. If the distance
at the tips is larger, reduce the length of the struts a little at
a time until the wings are parallel.
D 1. Sand the TE sheet and TE flush.
D 2. Mark the centerline on both sides of the shaped
1-5/8" x 7-1/2" balsa center TE. Place a mark 3/8" back
from the LE on both ends.
D 3. Draw lines connecting the centerline and the end
marks. Use a razor plane and sanding bar to trim the center
LE from the center mark to the end marks.
D 12. Draw lines on both sides of the struts connecting the
bases. Draw a line down the center of the strut parallel to
the side of the strut.
D 13. From the 1/8" x 1/8" x 36" balsa sticks, cut strut
braces to fit between the lines connecting the bases.
Measure 1-1/8" from each end and sand a bevel from the
end to the bevel line.
D 4. Glue the center TE to the TE of the top wing. Make
sure the center TE is centered on the wing and the ends of
the center TE are flush with the wings TE sheeting.
5. Sand the center TE flush with the top and bottom wing
sheeting. Be careful not to sand the TE too thin.
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