Brian,

the setup is simple enough. Basically you use a FG arrow shaft such as those from Dave Brown which have been around since he used them on his Tipo's and Illusions. The forked steel pushrods that go to the elevators are bent and attached to the shaft where appropriate. They are then bound to the shaft with some nylon or kevlar string and epoxy or JB weld. The rear of the shaft is cut to length so that when the elevators are in full up deflection, the end of the shaft is shy of hitting the tail post. The shaft itself is supported in the rear by a short length of metal tube that is embedded into the balsa tail post. The section is quite short since the shaft only moves back and forth a small amount. Provided the outer alum tube is short enough, weight and friction are not an issue.

The moment I saw that, I figured that was the way to go since typically the shafts are not supported by anything other than the servo wheel and the elevator control horns. The nince thing about centering the shaft in the rear with the above technique is that it helps to produce a more linear movement along the fuse centerline resulting in more uniform elevator deflections on both sides of the stab. This in turn allows you to be less critical about the location or orientation of installation of the elevator servo. I often place the elevator servo on it's side actuating on the fuse centerline which avoids lateral movement of the pushrod due to the rotation of the servo arm. Using the above approach allows you to more safely install the servo in a conventional upright fashion since the actuation in the rear is held on the fuse centerline by the metal section.

David.