Top Flite TOPA0155 - Manual (Page 31)

❏ ❏
19. The same as the flap hatches, mount the
aileron servo to a die-cut 1/8" [3.2mm] plywood
servo hatch. Mount the hatch to the wing. Be certain
the servo and hatch you are working on are
positioned the same as shown on the plan for the
wing panel you are currently working on. Add a few
drops of thin CA to the holes in the hatch supports
for the hatch mounting screws.
❏ ❏
20. Read "How to Solder" in the following Hot
Tip, then connect the aileron servo to the aileron
using the hardware shown on the plan. After you drill
the 1/16" [1.6mm] holes for the #2 x 3/8" [9.5mm]
screws that mount the control horn to the aileron,
harden the area and the holes by applying several
drops of thin CA. Allow the CA to harden before
mounting the control horn.
❏
21. Return to step 1 and build the right aileron.
If building flaps, the flaps will be completed after the
three wing panels have been joined.
Join the wing
❏
1. Glue both sets of die-cut 1/8" [3.2mm] plywood
wing joiners (WJ) together.
❏
2. Cut through rib W6 on the end of both outer wing
panels between the top and bottom spars (where
indicated by the arrows in the photo) and remove that
area of balsa to accommodate the wing joiners. Do the
same on both ends of the center section.
How to Solder
A. Use denatured alcohol or other solvent to
remove residual oil from the pushrod.
B. Thoroughly roughen the end of the pushrod
where it is to be soldered with coarse sandpaper.
C. Apply a few drops of soldering flux to the end of
the pushrod. Simultaneously heat the end of the
pushrod with a soldering iron or a torch while
coating the end of the pushrod with silver solder
(GPMR8070) by touching the solder to the pushrod
(this process is known as “tinning”). The heat of the
pushrod should melt the solder—not the flame of
the torch or the soldering iron. Note: Do not use the
acid flux that comes with silver solder for electrical
soldering.
D. Join the clevis to the pushrod. Add another drop
of flux. Heat the joint and add more solder if
needed. The same as when tinning, the heat of the
parts being soldered should melt the solder, thus
allowing it to flow. Allow the joint to solidify without
disturbing it. Avoid excess blobs, but make certain
the joint is thoroughly soldered. The solder should
be shiny, not rough. If necessary, heat the joint
again and allow it to cool slowly without disturbing.
E. After the joint has solidified but is still hot,
carefully use a cloth to wipe away residual
soldering flux. Important: After the joint cools, coat
the clevis with oil to protect it from rusting.
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