Top Flite TOPA0155 - Manual (Page 24)

❏
9. If not building flaps, sheet the bottom of the
wing from the center TE spar aft using the remainder
of the 3/32" x 6" x 24" [2.4 x 152 x 610mm] balsa
sheet used to sheet between the W2 ribs.
If not building flaps, proceed to “Fit the retracts.”
Build the inner flaps
Build the right flap first so your progress will
match the photos.
❏ ❏
1. Cut and remove the lower portions of ribs
W3, W4 & W5 along the lines partially cut earlier.
Make half-ribs that fit between the wing ribs from
leftover 3/32" [2.4mm] balsa. Glue the half-ribs into
position. Sand the half ribs and the trimmed-down
wing ribs even and sand the trailing edge of the wing
sheeting on top of the wing down to a thickness of
1/32". (Though bottom of the wing in the photo is not
sheeted, yours should be at this time.)
Refer to this photo for the following two steps.
❏ ❏
2. Use one of the die-cut 1/32" [.8mm] plywood
inner flap frames (IFF) as a pattern to make a flap
skin from the remainder of the 3/32" x 6" x 24" [2.4 x
152 x 610mm] balsa sheeting used for the bottom of
the wing.
❏ ❏
3. Cut the flap LE from the 1/4" x 1/2" x 36" [6.4
x 12.7 x 914mm] balsa stick and glue it to the top of
the flap skin (save the remainder of the stick for the
left inner flap and for the outer flaps). Glue the die-
cut 1/16" [1.6mm] balsa flap ribs F2 through F5 to
the flap skin and the flap LE.
❏ ❏
4. Cut the hinge blocks that go into the flaps
from the 3/8" x 3/8" x 30" [9.5 x 9.5 x 762mm] balsa
stick leftover from the hinge blocks for the wing. Glue
the hinge blocks to the flap. Use a bar sander with
80-grit sandpaper to sand the flap LE even with the
tops of the flap ribs and bevel the TE of the flap skin
to the same angle as the flap ribs.
❏ ❏
5. Glue the inner flap frame to the top of the
flap. Test fit the flap to the wing. Sand the flap as
necessary for a good fit.
❏
6. Build the left inner flap the same way.
If not installing retracts, proceed to “Mount the
flap servos.”
Fit the retracts
❏ ❏
R1. Cut a small hole in the bottom sheeting
between the retract rails.
❏ ❏
R2. Carefully enlarge the hole until the retract
rails and balsa supports can be seen.
-24-