Dynaflite DYFA1009 - Manual (Page 11)

BUILD THE INNER WING PANEL
U U 5. Accurately cut a 1/16" x 15/16" x 36"
balsa sheet to a length of 1 8". Then pin it in position
over the trailing edge of the plan so the root end
aligns with the centerline.
U 1. Before you remove the the die-cut 3/32" balsa
ribs and the die-cut 1/16" plywood parts from their
die sheets, mark them with a ballpoint pen as shown
on page 7. If you plan on covering the wing with
transparent film, neatly mark all the ribs in the same
location, or mark them in an inconspicuous location
so the marks will not be seen through the covering.
Q 2. Carefully remove all the ribs and the plywood
parts from their die sheets. If a rib will not easily
come out of the die sheet, do not force it but use a
sharp #11 blade to cut the wood where necessary.
Use a bar sander and 220-grit sandpaper to remove
any slivers or die-cutting irregularities.
Ql Q 3. Build the right inner wing panel first so
your progress matches the photos. Cut the wing
portion from the plan, or fold the plan so the right
wing panel is on top. Lay the right wing plan over
your building board, then cover it with wax paper.
Spar
T-Pins
U U 4. Pin a 1/8" x 1/4" x 18-1/4" basswood
bottom spar over its location on the plan so the root
end accurately aligns with the centerline of the wing
at rib W1 on the plan. Do not insert T-pins through
the spar but install them in a "criss-cross" pattern.
LJ LJ 6. Use a straightedge and a hobby knife to
cut halfway through one W1 rib and one W3-T rib
along a line connecting the aft edge of the spar
notches. Cut another line 1 /16" ahead of the first on
both ribs. Make the slots on the side of the rib that
will be visible when you glue the ribs in position. The
ribs in the photo are for the right wing panel. It is
easier to align these ribs and glue them in position if
they are in one piece instead of cutting all the way
through. These slots are for the plywood joiners and
will be cut all the way through later.
Q Q 7. Test fit four W3 ribs and one W3-T rib to
the bottom spar and bottom TE over their locations
on the plan. If necessary, adjust the notches in the
ribs so they fit the spar and bottom TE. Then use a
builder's triangle to make sure the ribs are
perpendicular as you glue them in position with thin
or medium CA.
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