The J is actually 11' 6" +/-1/2" (3505mm +/- 13mm) I recommend setting this at Max which will give you max rake in the rig thus better up wind performance. I set mine up 10 years ago with Spartite it was well worth the money rig has been in and out at least four times with no damage to the spartite plus almost no leaks at the deck when it rains !
Charlie Stoddard
fleet 13 measurer
