I've spoken with quite a few sailors and sailmakers...I don't think any of them say that a roller furled head sail will furl down more than about 30-35% and still hold a decent shape. I seriously doubt that Neil Pryde can do it either.
Besides, you really wouldn't want to do that IMHO. A good 140% genny designed for light air is going to be made of cloth too light to really survive heavy winds with the sail reefed down 50% without stretching out the cloth.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.