The Radial Dacron Sail Plan addresses the loads as they radiate from the three corners.
Loads take the path of least resistance as do some sailmakers....
Many sailmakers will say that this is a flawed design but only because the typical cross cut is less labor intensive and uses less cloth, thus more profitable.
We Use Warp oriented Dacron so the fibers are strong in the Warp direction in the Radial Section.
The Lower third and Upper Quarter of the sail are radial to stress relief the Loads as they radiate,
then the cross cut middle of the sail is excellent for shaping and controlling the draft.
The strong "Fill" fibers of the conventional Dacron are parallel to the loads in that section.