Dynaflite DYFA3045 - Manual (Page 14)

Use the “crossed-pin” technique to pin the
spars to the plan over the location for the
forward and aft bottom spars.
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3. Use a hobby knife and a straightedge to
cut partway through opposite sides of both
die-cut 3/32" [2.4mm] balsa wing ribs R2
between the forward spar notches.
Refer to this photo for the following
six steps.
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4. With the cuts made in the previous step
facing outward, glue both R2 ribs and the three
die-cut 1/8" [3.2mm] plywood R1B ribs to the
spars over their location on the plan. Use a
small builder’s triangle to hold the ribs vertical
as you glue. It is especially important that the
outer R2 ribs are vertical.
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5. Cut another 1/8" x 1/4" x 24" [3.2 x 6.4 x
610mm] basswood stick into two 9-5/8" [245mm]
pieces. Glue them into the notches in the top of
the ribs for the forward and aft top spars. The
same as when gluing the ribs to the bottom
spars, use a small builder’s triangle to hold the
ribs–especially the outer ribs–vertical as you glue.
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6. Glue the four die-cut 1/8" [3.2mm] plywood
inner bottom webs (labeled “IBW” on the
part) to the spars and ribs where shown. Glue
the die-cut 1/8" [3.2mm] plywood leading
edge doubler (labeled “LED” on the part) to
the R1B ribs, then cut the sub-leading edge
from a 1/16" x 3/8" x 24" [1.6 x 9.5 x 610mm]
balsa stick and glue it into position. Save the
remainder of the stick for the top center panel.
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7. Cut 4" from each of three 3/32" x 3" x 24"
[2.4 x 76 x 610mm] balsa sheets. After doing so,
you will have three 3/32" x 3" x 4" [2.4 x 76 x
102mm] balsa sheets. These are to be used for
shear webs. You will also have three 3/32" x 3"
x 20" [2.4 x 76 x 510mm] balsa sheets to be used
for sheeting the center panel.
❏
8. From one of the 3/32" x 3" x 4" [2.4 x 76 x
102mm] balsa sheets, cut two shear webs for
the front of the forward spars. Note that the
grain is vertical. Glue the shear webs into
position.
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9. Remove the bottom inner panel from the
plan. Use a bar sander to sand off any glue
bumps or uneven surfaces from the bottom of
the panel.
❏
10. Using one of the die-cut 3/32" [2.4mm]
balsa center panel trailing edges (labeled
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