Paul,



I find your remarks interesting and that they do not match my own experience. I switched from a Hobie 18 with Compost to a Mystere 6.0 that has a square top sail. The Nacra 6.0 has that square top, right?



(btw, I usually sail solo)



I find that the top of the Mystere sail spills, when overpowered, much more effectively than did the ComPost. The diagonal batton that extends the top of the leech bends wehn the sail is overpowered. When that top corner bends away, it takes much of the leech of the top portion of the sail, out with it. This results in a huge loss of sail shape up top and dumps a lot of pressure out of the windward side of the sail. That results in reduced healing.



I had a normal Hobie 18 before I had the one with the Compost. I was never satisfied with that compost. I also never noticed that it was any good at dumping air when overpowered.



Perhaps you are far more observant than I am. But while I never noticed the compost dumping air, I often see it happen with the square toped sail.