Hi Paul,
are you talking about this from experience 2 up with a self tacking jib and a high boom? From what I have been told it is surprising how much space there is on a 2 up F16 tramp, with the self tacker and high boom which the newer big heads allow. <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" /> Also I would be surprised if the beam to beam distance on say a F18 was actualy much larger than a F16, it is amazing how many cats have beams about the same distance apart. <img src="http://www.catsailor.com/forums/images/graemlins/tongue.gif" alt="" />