Originally Posted by tsailed
I bought a new 135 from Ulmer year before last. The leach fluttered on the wind from the first time it was hoisted. To stop the flutter I had to put enough tension on it to put a nasty looking 1" hook in the trailing edge.
tsailed, years ago I bought a new North 155 that acted exactly like your Ulmer 135. When I put enough tension on the leech line to eliminate the flutter, it looked to me like it had an awfully deep cup, but I assumed North knew what they were doing, and won a lot of races and regattas with that sail for over 20 years. To this day, I honestly don't know exactly how much cupping is too much, but, if the sail is fast (and that one was blazing fast), I don't care. I just put enough tension on the leech line to stop the flutter, and don't worry about it.