Assuming that he designs the sail with about 8 degrees twist and that it have a 8000mm leech, the buildt in twist is 640mm (I dont know how much buildt in twist he uses, but I think 8% should be about right for a sloop rigged cat).
Man, what have I been writing?? This is pure bunk of course! Twist is not expressed as a function of the leech length but the angle of the chords. Woke up in bed and realised what I had written earlier, can only blame it on the cold I caught on saturday
