2-300mm is still more than what I have seen on faster boats (F-18 and Tornado. But the F-16 two up should be as fast and this have similar apparent wind <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" /> ). Rule of thumb there is that you grab the luff with your fist, and rotate it between 45 and 90 deg, at least it used to be. I guess this lead to the following question: If you grab your spi-luff with a fist and rotate, how far can you rotate your fist before the luff becomes tight?

If 2-300mm is the norm, you need really big hands to stop at 90deg <img src="http://www.catsailor.com/forums/images/graemlins/laugh.gif" alt="" />