IMHO righting moment sailing downwind is insignificant w/asails since they are sailing at 2-5 degrees heel. Lets also remember thet the CofG is lower since the tack is much lower. In consideration of most J Boat designs, the sprit extends about 30-40% of J so I don't understand the comments of a 2-3 ft sprit addition, 7 ft seems more correct. Since much of the asym chute is blanketed by the main if tacked to/near the bow the tack needs to be further out, resulting in a bigger sail needed. The sial designs have evolved to the point that the luff rotates out to windward. With todays asails, they sail about 6-8 deg higher than sym chutes with a maximum TWA of 160 in higher winds, obvoiusly much higher than 6-8.
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