Great Planes 27% Extra 330S ARF - GPMA1413 - Manual (Page 11)

11
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7. Mount the servo arms to the aileron servos using the
appropriate servo adapters–the arms “point” toward the
wing tips. Note: If the screws that hold on the servo arms
have machine threads that go into metal output shafts in
the servos, use a drop of threadlocker on the screws before
mounting the arms.
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8. Make two 3-3/4" [95mm] aileron pushrods by cutting
the unthreaded end from two 4-40 x 12" [300mm] pushrods.
Solder a large metal clevis (the kind without threads) to each
aileron pushrod as shown in the Expert Tip that follows.
HOW TO SOLDER
1. Use denatured alcohol or other solvent to thoroughly
clean the pushrod. Roughen the end of the pushrod with
coarse sandpaper where it is to be soldered.
2. Apply a few drops of soldering fl ux to the end of the
pushrod, then use a soldering iron or a torch to heat it. “Tin”
the heated area with silver solder (STAR2000) by applying
the solder to the end. The heat of the pushrod should melt
the solder–not the fl ame of the torch or soldering iron–thus
allowing the solder to fl ow. The end of the wire should be
coated with solder all the way around.
3. Place the clevis on the end of the pushrod. Add another
drop of fl ux, then heat and add solder. The same as
before, the heat of the parts being soldered should melt
the solder, thus allowing it to fl ow. Allow the joint to cool
naturally without disturbing. Avoid excess blobs, but make
certain the joint is thoroughly soldered. The solder should
be shiny, not rough. If necessary, reheat the joint and allow
to cool.
4. Immediately after the solder has solidifi ed, but while it
is still hot, use a cloth to quickly wipe off the fl ux before it
hardens. Important: After the joint cools, coat with oil to
prevent rust. Note: Do not use the acid fl ux that comes
with silver solder for electrical soldering.
This is what a properly soldered clevis looks like–shiny
solder with good fl ow, no blobs, fl ux removed.
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9. Connect the ailerons to the aileron servos using the
hardware shown in the photo on page 10. Before mounting
the horns, drill 3/32" [2.4mm] holes for the screws. Temporarily
mount the horns with the #4 x 1/2" [13mm] screws. Remove
the screws and add a few drops of thin CA to each screw hole.
Remount the horns with the screws after the CA hardens.
Caution: Be certain you have used 4-40 threaded clevises–
not solder clevises on the threaded ends of the pushrods.
Set the wings aside while you work on the fuselage.
ASSEMBLE THE FUSELAGE
Mount the Horizontal Stabilizer
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1. The same as was done for the aileron servo openings in
the wings, cut the covering from the elevator servo openings
in both sides of the fuselage and use a trim iron to seal the
edges of the covering down inside. If not using the pull/pull
rudder servo setup and mounting the rudder servos outside the
fuselage, cut the covering from the rudder servo openings
too. Also cut the covering from the openings for the horizontal
stabilizer and, if mounting the rudder servos internally with
the pull/pull setup, cut the slots for the cable exits.