High Quality Plan Sets and Laser Cut Partial Kits for Radio Control
Aircraft
Page 23
Henry Struck's 1937 Benny Boxcar in 108 inch span
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.
