Re: Man over board
I've used (with a simulated 'COB') a sling by detaching the jib from the headstay, keeping the tack attached, sheeting in tight, and hitching the head to the spinnaker halyard (because of its ability to pull from the side). Toss the rest of the jib (or genoa) in the water, and have the COB swim into it, then hoist. They roll a bit, but it's against a smooth surface. We were able to guide an 'unconscious' victim into the sling with a boat hook. Not ideal for possible spinal injury, as in knocked overboard by a boom to the head, but if nothing else is possible, it beats drowning (inviting arguments, I know).
As many have said, stay on board in the first place. Remember, most bodies found floating are guys with their zippers down...