Pushrod Instructions

 

 

1.           Find the materials for the pushrods and bend adjustment angles into half of the z-bend wires. I do these bends with a set of rounded needle nose pliers but V shaped bends are just as good. Following this method you will probably never need to do any adjustments that way.

 

 

2.           Using the heat shrink tubing, attach the adjustable wires to the 4 carbon fiber pushrods. Do not glue the wire in place at this time.

 

 

 

 

 

 

3.           Insert the shorter pushrods into the anti-differential bellcrank on the aileron servo. Note that the pointed lobes on the bellcrank face forward. This bellcrank provides a perpendicular connection from the servo pivot to the control horn giving the same up and down throw to the ailerons. Without it the angle would cause mechanical differential. Cut the pushrods 1/4-1/2 back from the aileron hinge line with the bellcrank centered.

 

4.           Remove the pushrods from the plane and use heat shrink tubing to attach two of the remaining straight z-bend wires to the cut ends. Do not glue the wires in place. This will allow us to do the fine adjustments of the pushrod lengths. You should end up with pushrods that look like this.

 

 

5.           Install the pushrods into the aileron horns and then with the bellcrank loose, insert the adjustable ends into the outer hole, second from the front lobes. Pop the bellcrank back onto the servo and center it and adjust the ailerons so they are level. The rods/z-bends will slip under the heat shrink tubing to allow this adjustment but also hold it in place for gluing. With paper towel or plastic under the pushrods to avoid marring the paint, glue the wires to the carbon fiber rods with CA to hold this position.

 

6.           Following this same procedure, create the longer tail pushrods using the remaining pieces. Be sure to put the pushrod standoffs on the rods before you create the second end.

 

7.           When the tail pushrods are completed and installed, poke and glue (Foam-Tac) the standoffs into the foam at 1/3rd distances from the ends. Adjust the depth of the standoffs to hold the pushrods as straight as possible from end to end.

 

8.           With your servos plugged into the Rx, center your servos as best you can, removing and centering the arms to the closest spline. Adjust the final centering with the subtrim for each channel so you have perpendicular arms and full trim available. Now use the servo arm screws and lock the arms in place on the servos.