On further reflexion, I can answer my own question.
Or wait for more entertaining asides..he he
Curving the ends of the battens the wrong way will allow us to sail hands off, as the sail will act like a hang glider banked ninety degrees.
Hang gliders used to have "reflex bridles", which stopped them inverting and the pilot falling into the wing. Which was an unplanned manoover..
I can't afford 30 megabytesfrom my allowance. Summary please..
I note that the raceboard sail range does not have reflexes.
Does this mean that reflex trades efficiency for controlability?