Actually Wouter that answer can only account for about 75mm of difference. FYI....i tried Han's sail (original Landy sail) on my boat & the foot was too long. I was going to try it for the Nam Rem race, but the mainsheet angle was huge.

The difference was the positioning of the beams on various boats....some were closer together & others further apart. I will let you speculate on what was which..??? <img src="http://www.catsailor.com/forums/images/graemlins/tongue.gif" alt="" />