❏
1. Permanently join both elevators to the stab by gluing
in the hinges with thin CA.
❏
2. Make an elevator pushrod by threading a 4-40 nut and
a 4-40 clevis with a silicone retainer onto a 4-40 x 36"
[910mm] pushrod. Connect the clevis to the outer hole of a
large nylon control horn. Prepare another pushrod the same
way. Insert the pushrods into the guide tubes from the rear
of the fuselage.
❏
3. Position the pushrods so the holes in the control horns
are over the hinge gap between the elevators and stab.
❏
4. Use a felt-tip pen to mark the front of the pushrods
where they are to be cut for connecting to the elevator servo
arms with metal solder-on clevises.
❏
5. Remove the pushrods from the fuselage, cut them to
the correct length, then read the following Expert Tip and
solder the clevises to the ends of both pushrods.
How to Solder
A. Use denatured alcohol or other solvent to remove
residual oil from the pushrod.
B. Use coarse sandpaper to thoroughly roughen the end
of the pushrod where it is to be soldered.
C. Apply a few drops of soldering flux to the end of the
pushrod, then use a soldering iron or a torch to heat it.
Coat the end of the pushrod with silver solder
(GPMR8070) by touching the solder to it. The heat of
the pushrod should melt the solder–not the flame of the
torch or soldering iron–thus allowing the solder to flow.
Note: Do not use silver solder for electrical soldering.
D. Join the clevis to the pushrod. Add another drop of flux,
then heat and add solder. The same as before, the heat
of the parts being soldered should melt the solder, thus
allowing it to flow. Allow the joint to cool without
disturbing. 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 to
cool slowly without disturbing.
E. After the joint has solidified but while it is still hot, carefully
use a cloth to wipe away soldering flux. Important: After
the joint cools, coat with oil to protect it from rusting.
❏
6. Remove the threaded clevises from the aft end of the
pushrods. Guide the pushrods through the front of the
pushrod tubes from inside the fuselage and thread the
clevises back onto the pushrods. Connect the front of the
pushrods to the elevator servo arms. Make slight bends in
the aft end of the pushrods as necessary, then drill 3/32"
[2.4mm] holes through the elevators and mount the horns
with 2-56 x 3/4" [19mm] screws and the nylon plate that
came with the control horns.
Correct
Incorrect
Hook Up the Elevators
19
