Top Flite TOPA0405 - Manual (Page 17)

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22. Cut eleven 1-1/4" long pieces from the
3/4" x 3/4" x 30" balsa stick to make hinge point
backups. Glue the backups at the flap and aileron
locations shown on the plan and sand them flush
with the edges of the ribs.
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23. Cut the 1/4" x 1/2" x 12" maple stick to
make the retract rails. Test fit the rails in the slots
in W-4 and W-5. The edge of the W-5 rail should
be flush with the side of rib W-5Z. Test fit the
retract in the wing and trim the ribs and rails as
needed. The rails will need to be glued into the
slots in the ribs at a slight angle so that the retract
mounting flanges sit flat. You will need to trim the
ribs appropriately.
NOTE: Pay close attention to your retract installation
at this time. Be certain the retracts fit well and
operate correctly, and make sure the top of the
retract mechanism does not protrude above the
top of ribs W4 and W5 (this would cause the
retracts to interfere with the top wing sheeting). If
necessary, lower the retract by shimming with
leftover 1/16" or 1/8" plywood. If adjustments are
required, now is the time to do it.
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24. Use 30-minute epoxy to glue the rails
into the slots. Wipe off any excess epoxy that may
squeeze out under the retract rails. Place the
retracts on the rails so that the rails are glued in at
the correct angle. Allow the epoxy to cure before
removing the wing panel from the building surface.
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25. From the 1/4" x 1/4" x 6" hardwood stick
make retract rail doublers. The doublers fit under
the retract rail in rib W-4 between the hole for the
air cylinder.
NOTE: Try to store your wing panel on a flat
surface with some weights on top of it until the
wing panels are joined and sheeted, to prevent
warping.
Repeat steps 1 through 25 to build the other
wing panel.
A. Cut a piece of paper slightly longer than the
length needed to reach from the aileron servo
bay to the wing root.
B. Roll the paper into a tube slightly smaller than
the holes in the wing ribs. Use a couple of
pieces of tape to hold the tube together.
C. Insert the tube into the holes in the ribs. Tack
glue the tube to the ribs with CA.
HOW TO MAKE SERVO LEAD TUBES
When the aileron servos are mounted out in the
wing, it can be difficult to run the servo wires
through the ribs to the wing root. An easy
solution is to make servo lead tubes.
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