Top Flite TOPA0708 - Manual (Page 7)

7
ASSEMBLE THE WINGS
Start with the left wing so the assembly matches the
photos the fi rst time through.
❏
1. Lay a few paper towels on top of each other and cut
them into small squares. These paper towel squares will
come in handy for wiping away excess epoxy throughout
the assembly process (and will save you from wasting
whole paper towels).
❏
2. If necessary, use a covering iron with a covering
sock to go over the wing, fl ap and aileron to remove
any wrinkles. The best method to remove the wrinkles
is to glide the iron over the covering until the wrinkles
disappear, then go over the area again, pushing down on
the iron to bond the covering to the wood. If the wrinkles
don’t disappear, the balsa in that area might be fl exing
inward. If this is happening, don’t press down. Simply let
the heat of the iron shrink the covering. If the wrinkles
momentarily disappear, then immediately reappear, the
iron may be too hot, thus causing air bubbles. Lower
the temperature of the iron or use a sharp #11 blade
to puncture several holes in the covering, then reheat.
The suggested iron temperature is around 360 ˚ F.
MOUNT THE AILERON SERVOS
❏ ❏
1. Carefully remove the left aileron servo hatch
from the wing by peeling off the masking tape holding
hatch to the wing. Use a paper towel square dampened
with naphtha lighter fl uid or similar solvent to remove
any glue left behind from the tape.
❏ ❏
2. Install the rubber bushings and metal grommets
in the aileron servo. Install a servo arm on the aileron
servo. Position the aileron servo on the aileron servo
hatch cover as shown. Set the two 9/16" x 3/4" x 3/8"
[15 x 20 x 8mm] hardwood blocks over the embossed
servo block locations to check that the block locations
are correct. If not, mark the new locations.
When mounting the servo blocks on the bottom of the
servo hatch, make sure that the grain of the wood is
perpendicular to the hatch.
To increase the strength of the glue joint, use a T-pin
to prick holes into the gluing surface of the servo
blocks and the plywood servo hatch. Be careful not
to prick holes completely through the servo hatch
and covering.
❏ ❏
3. Use 6-minute epoxy to glue the two blocks to
the bottom of the servo hatch over the embossed servo
block locations. Thoroughly coat the end of the blocks
and allow them to set for a few seconds to allow the
blocks to absorb the epoxy, then recoat the blocks. Use
clamps to hold the blocks to the servo hatch.
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4. Once the epoxy has cured, remove the clamps.
Place a 1/16" [1.6mm] spacer, such as a piece of
cardstock from the header card of the servo extension
or a piece of paper folded several time, under the servo
and between each mounting block. After the servo is
installed the spacer will be removed, providing adequate
spacing for vibration isolation.
❏ ❏
5. Drill 1/16" [1.6mm] holes through the blocks
for the servo mounting screws. Mount the servo to
the blocks with the screws that came with the servo.
Remove the servo mounting screws and apply a couple
of drops of thin CA in each hole to harden the threads.
Allow the CA to fully harden. Then, reinstall the servos
and remove the spacer.
❏ ❏
6. Drill 1/16" [1.6mm] holes through the blocks at
the two hole locations on the top of the hatch. Install
two #2 x 3/8" [9.5mm] fl at head sheet metal screws to