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Mark _australia said..
So whats the difference with a sail for foiling?
When sailing in light winds you are in dinghy racing territory, and a typical rig that works well has a higher aspect and a tighter leech at the head.
The higher rig helps catch the better airflow away from the friction of the water, plus the tight leech harnesses that flow to get you going earlier.
Once foiling you move pretty fast for a light wind day, and that means the 'created' wind forms a great part of the 'apparent' wind you sheet in your sail to. So, for example, you may stay sheeted in even when going well downwind.