Dynaflite GPMA0090 Butterfly - Manual (Page 10)

10
❏
1. Before you remove the balsa ribs from their
die sheets, use the photos to identify the ribs and
mark them with a ballpoint pen as shown. If you
plan to cover the wing with transparent MonoKote
fi lm, mark the ribs neatly all in the same location
or mark them in an inconspicuous location so the
marks will not be seen through the covering.
❏
2. Remove all the ribs from their die sheets, then
use a bar sander and 220-grit sandpaper to remove
any slivers or die-cutting irregularities. Save the
leftover 1/16" plywood from the W-1s to be used
later during fi nal landing gear installation.
❏ ❏
3. Pin a 1/8" x
3/8" x 24" basswood
bottom inner spar
over its location
on the plan so the
tip “ends” at the
centerline between
the laminated W-4s
as shown on the plan.
Do not insert T-pins
through the spar
but install them in a
criss-cross pattern.
❏ ❏
4. Position rib W-3 on the bottom spar and pin
it to the building board over its location on the plan.
Position the six W-4s of the inner wing panel on
the spar and pin them to the building board as well.
Note: Substitute the third W-4 rib in from the tip
with a W-3.
❏ ❏
5. Position a
3/8" x 1-1/4" x 21"
tapered balsa
inner
TE over its location
on the plan so the
tip aligns with the
centerline at the
laminated W-4s on the plan. Securely pin the TE to
the building board so it tightly contacts the wing ribs.
❏ ❏
6. Position a 3/8" x 3/4" x 21" balsa inner LE
over its location on the plan so the tip aligns with
the centerline at the laminated W-4s on the plan.
Securely pin the LE to the building board so it tightly
contacts the wing ribs.
T-Pin
Spar
Work Surface
90º
Bottom