Thanks Jake! I thought it was end to end. I was hopeing it was hull to hull. Didn't mean to start an argument about this. Just wondering how much I would have to alter the beam on a Hobie 18 to make it legal. Also looking at going with a self tacking jib config and a straighter section would help with that application. I think the saddles on the 18 have more than 15mm of rise from outside to inside. Thanks again for the info.