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I would think you'd need a way to adjust from no flapping to lots of flapping, no matter if one up or two. Having the flap in light conditions doesn't make much sense to me...but I'm not a sail designer!


Downhaul is a great way to adjust this, combined with spreader rake and diamond tension. <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />
I dont make sense for me either to have a flapping leech when not overpowered.

The way you sail your spi was the same way we did it on the T, but we found it to be faster with just 45deg of "fist-twist". I guess it comes down to sail trim, helming and conditions. Setup would probably differ between different sails and classes.