High Quality Plan Sets for Radio Control Aircraft
Henry Struck's 1937 Benny Boxcar
Scaled to 108 inch span
Page 23
This is where the cord will intercept the fuselage covering. A notch had to be cut in a left side diagonal where the lower elevator cord passes it (the lowest cord visible here), and two small depressions were
made in the upper crossmember where the rudder cords pass through. The upper elevator cord intercepts father forward. 1/64 ply plates will be installed at all the intercept points to facilitate covering.
Ends for the control cords are made by inserting 2-56 threaded rods into electrical terminal ends that are then crimped on to the rods and then soldered
together. It is best to use nylon clevises as they will not turn freely on the rod ends as metal ones can, because of course the cords will not resist rotation.
A rod of some type should be inserted between the knots and the clevis or servo horn so the cord can be free to move where it is attached. Multiple half hitch knots are tied and pulled tight.
Once the knots are complete they are secured with thin CA, taking care not to let the CA spread beyond the knotted area. It is a lot easier to connect the cord to the servo arms first and then do the control surface end.
When doing the control surface end, screw the clevis end out on the rod end so you will have a good margin to increase the tension when the knots are complete. The receiver should be powered up and the servo arm
should be centered, and the control surface should be clamped in the neutral position. With the clevis attached to the control surface arm, insert the cord in the terminal end, tension the cord and then clamp the cord to
the terminal end. Remove the clevis from the control arm and tie some knots. After enough are tied to insure no movement, check the cord tension by attaching the clevis to the control arm. If it is good enough,
complete the knots and secure them with CA.
A view of the completed control parts on the tail.
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