Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 32)

6. Make a 1/2" deep razor saw cut down the center
of the rear fairing block (cut from the side facing the
wing), which will permit the block to bend to the shape
of the wing.
7. Hold the rear fairing block in place, leaving a
slight (1/32") gap between the back of the block and the
front ofF-4, and apply a couple drops of thin CA to tack
it in place. Remove the wing bolts and remove the wing
from the fuse, then glue the block securely in place.
11. Remove the wing and securely glue the front
8. Glue the two remaining rear fairing blocks to the
bottom of the wing in a similar manner. You'll have to
make a saw cut in the center of the 3/8" block (and
possibly the 3/16" block) to permit bending at the
centerline.
fairing block to the wing. Fill all gaps with balsa filler.
After the filler has dried, replace the wing on the fuse and
sand all the fairing blocks to smoothly blend the wing to
the fuselage.
INSTALL WING FILLETS (OPTIONAL)
NOTE: The wing fillets are a nice addition to the
US40. They make it more pleasing to the eye and
they do help to reduce drag. The US40 flies just fine
without them, however, so the choice is yours
whether or not to install them.
1. Tape an 8" x 13" piece of waxed paper onto the
9. Carve and sand the 7/8" x 3" tapered balsa front
fairing wedge to fit the top of the wing. Round the
comers of the block to match the fuselage. NOTE: It is
difficult (and not necessary) to try to carve this block to
mate exactly with the wing; therefore, you should just
'' rough it out", then later you can fill any gaps with balsa
filler.
10. With the wing in place on the fuse, hold the front
fairing in place (allow 1/32" gap between the fairing front
and the rear of F-2A) and tack glue it to the wing.
CAUTION: Use extreme care to avoid gluing the
wing to the fuselage!
top surface of the wing at the center, then attach the wing
to the fuse with the wing bolts.
2. Lay the die-cut 1/32" ply wing fillet bases on the
wing and glue them to the fuselage sides. NOTE: For
this procedure, we recommend that you use thick CA
glue sparingly, and "kick" the glue with accelerator
spray immediately after applying, to avoid accidentally
gluing the wing to the fuse with "stray'' glue. NOTE:
Bend the aft 1-1/2" of the fillet base to horizontal (see
sketch on top of next page).
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