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The carbon pushrods come with one pre-glued z-bend. Add a drop of thin CA to the pre-glued
Z-bend as precaution and install it into the aileron control horn (insert the z-bend from the
wing tip side of the horn). The CF servo arms and control horns were pre-drilled for the Z-
bends; however, they were drilled undersized to achieve a tight slop-free fit. Use the sharp
end of the Z-bend to self “drill” the mounting hole. This ensures a perfectly sized hole that will
prevent any undesired ‘play’ in the control surface during flight. Do not force the Z-bend into
the horn but instead gently rotate it back and forth into the CF control horn.
Take one of the four pieces of heat shrink tubes and cut a small piece (2-3mm 1/8”) off the
end. Slide the longer followed by the shorter piece of tube onto the pushrod. Temporarily
attach the z-bend to the pushrod using the smaller piece of heat shrink. Use a heat gun or
cigarette lighter to shrink the tube, NEVER apply heat to the heat shrink tube near the covering
film, as this will cause the film to melt. This will require you to remove the servo arm whenever
applying heat).
For correct linkage geometry use the PA CF servo arms and install the Z-bend in the correct
mounting hole (see photos). Z-bend should be inserted from the underside of the servo arm
(this applies to all servo arms except the elevator).
NOTE: Any deviation from this setup will affect the performance or even overload your servos!
Temporarily tape the aileron in neutral position, install the servo arm and center it in neutral (90 degrees to the servo
case). Next, adjust the length of the pushrod by sliding the Z-bend along the CF rod as required and verify alignment.
With the pushrod in the correct length, tack the assembly with a tiny drop of thin CA just enough to temporarily hold the
assembly in place. Once the glue sets carefully remove the entire assembly without breaking it apart. Then tightly wrap
the Z-bend to the pushrod using the supplied string. Soak the string in thin CA and immediately slip the long heat shrink
tube over and shrink it. Allow the CA to set before re-installing it back on to the servo.
NOTE: It is best to apply a tiny drop of CA to the end of the string to prevent it from unraveling.
Follow the same steps to install the other aileron linkage.
Verify the gluing integrity of all Z-bends prior to final installation. To do so simply try to rotate and pull the Z-bend out
applying reasonable force. These pushrods have been proven to be extremely reliable under extreme flight loads if made
properly. We don’t recommend changing to metal linkages which tend to flex and are heavier, therefore, shift the CG.
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