I've been doing a lot of gusty, partly sub planing sailing on the iS86. It's easier than the volume suggests. The flat/concave deck and the wide tail/straight outline makes it a very stable platform. Remember, when you're schlogging, anything that is above the water line will rather take away from than add to the stability. As long as you are not downright sinking (ie standing completely still), width and a full rail shape will help more than any extra volume coming from more thickness.
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