Originally Posted by Bash
That's called a "flattener reef." While it doesn't reduce the sail area much, it will significantly alter the shape of the sail, helping not only to flatten it but also to make it point higher.
Play with that reef, and you'll find itI think can make a huge difference.
I think you misread my post. The Cringle is only 6" closer to the mast
than the clew. It's a few feet above the boom. I've has a main with a flattening reef, but that's not what I'm taking about.
I just don't see a reefed main being any different than a loose fitted main. Similar forces in similar places.