Originally Posted by Liquorice
I agree with Skipper995!
Below 2 or 3 knots wind the sail needs to be flattened or you can't keep the flow attached.
I'm not arguing flat vs full...what I'm trying to say is that in real light air, the full weight of the boom alone will physically pull the clew down (gravity sucks...) and this will cause the leech to turn hard to 'windward', closing off the leech. This creates a very non uniform camber that cannot promote good attached flow - it is, as I said, like having full flaps on an airplane wing.
Whether you're of the 'flat' or 'full' mindset - you want a smooth uniform curve and a clean exit...
In light air do you crank on the leech line on the genny to induce a 'hook' in the leech??? Same thing.