Top Flite TOPA0220 - Manual (Page 33)

❏ 2. Mark the joiners where they protrude from the
right wing. Remove them and trial fit them in the left
wing panel, making sure that they can be inserted at
least as far as the marks. If they can’t, find out why.
If they are slightly long, trim them as needed. DO
NOT apply any glue.
❏ 3. Now join the right wing panel to the left,
inserting the joiners into the right panel. Place the
joined wing upside down on the building board (this
will give a small amount of dihedral). The wing
panels should fit as in the photo above. You may
need to use a long flat sanding bar to sand the side
of W1 flat. Adjust each panel so they fit together
properly. The photo above shows how ours fit with
NO sanding.
❏ 4. When you are satisfied with the fit, get the 30-
minute epoxy and mix 1/2 oz. [14g]. Liberally coat the
side of both W1 ribs and the basswood spars, balsa
web and ply spar joiners where they join together.
Slide the joiners and wing panels into place. Use a
paper towel and alcohol to clean any epoxy that
seeps out. Place the assembly on your workbench
upside down. Hold the assembly together with pins
and masking tape.
Note: The wing joint depends on three things for its
strength; the epoxy joint between the ply spar joiners
and the basswood spars, the epoxy joint between the
balsa web and the ply joiners and the center sheeting
that will be installed in the following steps.
❏ 5. Use a sheet of 1/16" x 3" x 24" [1.6 x 76 x
610mm] balsa to cut and fit the bottom center
sheeting. Fit the first piece to the trailing edge. Use
a single strip of balsa to sheet from one W3 rib,
across the center W1 ribs to the other W3 rib. Glue
this piece of sheeting in place with medium CA.
❏ 6. Use the remainder of the sheet to fit a piece
between the leading edge sheeting and the piece
you just installed.
The top center section of the wing will be sheeted
after the flap servo is installed.
MOUNT THE SERVOS IN THE WING
❏ ❏ 1. Mount an aileron servo to two 5/16" x 3/4" x 7/8"
[7.9 x 19.1 x 22.2mm] servo mount blocks with the
screws, grommets and eyelets included with your servo.
❏ ❏ 2. Mark the edge of the aileron servo hatch rails
on the inside of the hatch. Remove the hatch from
the wing and use 30-minute epoxy to glue the servo
mount blocks, with the servo attached, to the servo
hatch where shown on the plan. Position the servo
within the lines you marked inside the hatch
indicating where the rails are. The servo arm should
be located in the center of the cutout in the hatch.
Note: Roughen the hatch with sandpaper where the
blocks will be glued so the glue will adhere better.
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