Great Planes Giant Revolver ARF - GPMA1425 - Manual (Page 7)

7
Hinge Line Hinge Line
CORRECT INCORRECT
Hi
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8. The aileron has a plywood control horn mounting
plate built into it. Place a control horn onto the plate in line
with the servo arm. Drill a 3/32" [2.4mm] hole through each
of the four mounting holes, into the plywood plate. DO NOT
DRILL THROUGH THE OPPOSITE SIDE OF THE AILERON!
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9. Install and then remove a #4 x 5/8" sheet metal screw
into the four holes you drilled. Apply a couple of drops of thin
CA glue into the holes to harden the threads. Allow the glue
to harden.
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10. Secure the horn to the aileron with four #4 x 5/8"
sheet metal screws.
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11. Locate a 4-40 x 5-3/4" [146mm] threaded pushrod
wire, 4-40 nut, 4-40 threaded clevis, 4-40 solder clevis and
two silicone clevis keepers. Assemble the pushrod as shown.
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12. Install the pushrod assembly to the servo arm. Install
the 4-40 solder clevis into the hole second from the end of the
control horn. Center the aileron and make a mark on the wire
where it will need to be cut. Remove the pushrod assembly
and the solder clevis. Cut the wire on the mark you made.
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, and then use a soldering iron or a torch to heat
it. “Tin” the heated area with silver solder 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 being disturbed. 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 the joint
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 flow, no blobs and flux removed.
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13. Using the instructions in the Expert Tip, “How To
Solder”, install the 4-40 solder clevis onto the end of the
pushrod wire soldering the clevis to the wire. After the solder