for Mark (upwind angle & sail longevity)
Would it be 10, 15, 20 or 30 degrees, you ask? The answer is alas YES to all. There are simply too many variables involved to pin it down much further. Sailing close to the wind while maintaining adequate speed is like sailing in very light winds in that one is trying to make the best of a very small forward driving force. The slightest disturbance, whether caused by wave action, a dirty hull, a dragging rudder or a poorly trimmed sail can snuff out all forward movement. Monohulls are usually heavier and therefore less affected by wave action. So, all other factors being equal, I would expect the difference in on the wind performance to be smallest (10 - 20 degrees?) in relatively flat conditions and largest (20 - 30 degrees?) in heavy seas . Maybe others can weigh in with their own estimates. With regard to the expected lifetime of sails there are again many factors to consider, e.g. quality of the fabric, hours of use in heavy winds, exposure to UV light and winter storage conditions. Unless the sails are heavily molded, chafed or torn there is not a lot that can be learned without actually hoisting them and trying to flatten them out. A sail that has seen heavy use will tend to be baggy and difficult to flatten. This may be most pronounced on first reef. Naturally, on the water testing would be best. If she sails well and the sails don't look too worse for wear you should be able to get several more years of good use out of them, unless you plan to become a racer.....Have fun,Flying Dutchman