Top Flite TOPA0155 - Manual (Page 27)

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2. Drill 1/16" [1.6mm] holes in two 5/16" x 3/4"
x 7/8" [7.9 x 19.1 x 22.2mm] basswood servo mount
blocks and mount the aileron servo to the blocks
using the screws that came with the servo. Glue the
servo mount blocks to a die-cut 1/8" [3.2mm]
plywood servo hatch with 30-minute epoxy (be
certain the servo is positioned on the hatch as
shown on the plan for the side of the center section
you are working on, and that the servo arm is
centered in the opening in the hatch). Note: The
basswood servo mount blocks are porous and
rapidly absorb epoxy. Apply a few coats of epoxy to
the blocks and wait a few minutes between coats to
let it soak in before mating the blocks to the hatch.
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3. After the epoxy has hardened, remove the
screws that mount the servos to the blocks. Apply a
few drops of thin CA to the holes and allow to
harden. Remount the servo to the blocks.
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4. Place the hatch (with the servo) over the
hatch supports on the wing. Securely holding the
hatch in position, drill six 1/16" [1.6mm] holes
through the punchmarks in the hatch and the hatch
supports. Without moving the hatch, use a ballpoint
pen to draw the outline of the hatch directly onto the
sheeting. Remove the hatch.
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5. Enlarge the holes in the hatch only with a
3/32" [2.4mm] drill. Countersink the holes in the
hatch for the #2 x 3/8" [9.5mm] flathead hatch
mounting screws. Hint: Use a Dremel #178 cutting
bit to countersink the holes.
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6. Add a few drops of thin CA to the holes in the
hatch supports for the hatch mounting screws and
allow to fully harden. Mount the hatch with the screws.
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7. Return to step one and mount the other flap
hatch the same way. Make certain the hatches are
positioned as shown on the wing plan.
This is all that can be done on the center section
until the outer panels are completed and joined.
Build the outer wing panels
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1. Build the left outer panel first. Cut the left wing
panel plan from the wing plan and place it over your
flat building board. Cover the plan with Plan
Protector so glue will not adhere.
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2. Make two spar doublers as shown on the
plan from the two 1/8" x 3/8" [3.2 x 9.5mm]
basswood sticks leftover from the center section.
Glue each spar doubler to a 3/16" x 3/8" x 24" [4.8 x
9.5 x 610mm] balsa stick as shown in the photo, to
make the top and bottom outer main spars. Cut
the spars to a length of 19-3/4" [502mm].
Refer to this photo for the following seven steps.
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3. Using care, widen the notches in one set of
die-cut 3/32" [2.4mm] balsa wing ribs W6 through
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