Installation of control systems in the fuselage

Installation of control systems in the fuselage

The fuselage structure is now waiting for me to install the controls before closing it. Scale models required taht control of the flap looks like at the real one. That means back and forth cables for both elvator and rudder

The servos are installed under the cabin. A 2 mm plywood is glued under the fuselage and the place of servos was cut out. At the front is the gas servo.

Command controls will be back and forth cables as on the 1:1 size.
I had questions that had been the subject of a post on the aeromodelling forum (Commandes profondeur câbles aller retour maquettes).

In particular, I indicated that my concern was for elevator. A close examination of the vintage photos (the full-scale no longer exists), indicated to me that I had to provide back and forth cables for elevator and therefore 2 cables in addition to those of the derivative…. Furthermore, they have to exit from the fuselage at the same location that observed on full-scale model.
My concern was how to do it. Thank you to the community of this site and in particular Alain and Roland by whom the idea of the intermediate horn came.

It remained to be realized. The intermediate horn is triple, with 2 double horns for cables and a single one connected by rigid control to the servo. It should be slid into the last third of the fuselage. I did a lot of testing and in particular the solution of putting eyelets to screw in solid aluminum tubes which would be slid at these ends in a tube fixed in the fuselage. This solution did not prove conclusive, as after screwing, it was not very solid. There would have been the solution to braze, but it is finally towards a 3rd solution that I went .
It consisted of a 4 mm threaded rod. I bought Tower pro, which I tapped and put in place on the rod. They were blocked by nylstop nuts in the final version. Two pieces of aluminum tube were cut and the rod slid in at these 2 ends which were put in place definitively in wooden reinforcements in the fuselage.
Some photos of the prototype and its provisional location in the fuselage.

Installation of the “triple” horn for the elevator flap.
On the first picture, you can see the rod with the horns mounted and locked with locking nuts, the 2 pieces of aluminum tube in which the rod will be placed with the horns. The 2 pieces of wood are drilled to the diameter of the tube in which the threaded rod slides. The wooden supports are glued with epoxy on the internal side of the fuselage.

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On the following, the assembly is put in place and glued into the fuselage.

eol37

Scientific and passionate about aviation and aeromodelling for 45 years, I am here to share with you my models, my techniques, my achievements and what I have learned over the years.

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