Hi guys and thank you for your attention.
@ wefalk and Ken: yes I know there was a change to furling sail before and after the jack-stay. The prototype show in the protos is made by a simple wooden stick and a canvas just cutted rectangular. That prototype is equipped with 2 leechlines each side and 2 buntlines on the bottom, all made by a simple black sewing thread.
In other words, I tested if there is the possibility to obtaining a result at last similar to the photo of the model I show. The big question , for me, was "how the clew lines can come out from the top of the furled sail". Now I know how it's possible to do it.
It is clear that on a real model the job must be done with accuracy.
Just till before this test, I was able to furl a sail only as shown in this photo:
This new experience will be usefull on some next model, currently I am building a shooner and I think the sails will be "to the wind".
ciao ! oldboy.