Hi dons boat work and ltdoc:
bothheories seems to be right. sngle line directly from boom to servo arm will require some amount of pulling power.

if i use a ring or a pulley beteween the boom and servo arm the servo will pull double distance ...it means that i can attach the sheet line to the boom double distance far from the pivot point next to the mast ...so pulling power is reduced to the half......finally same pulling power requiered and achieving the same angle movement in the main boom and jib boom.

the only difference is that i could use a shirter servo arm if using a pulley or ring.....

that is my primary conclusion starting from your posts. i will try to check i n real life if i am right...


thanks for the i nfo and the sketch.

may be tomorrow i will start to post my boat construction from plans.

Tato Lazo