I'm not sure why you were being downvoted. There's a huge amount of theory relevant to sailing any boat and no special reason one would need to consider keels a

I'm not sure why you were being downvoted. There's a huge amount of theory relevant to sailing any boat and no special reason one would need to consider keels above any other interaction of a sail with a boat. I do a bit of kite skiing and I'm hardly likely to complain that the article doesn't consider uphill and downwind sailing enough.