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.
I don't understand why you are heading in this direction...I mean...if you are that concerned about fitting the F18 rule why not just buy an F18 boat?
Secondly, if the curved beam is all you have left that is not F18 compliant, as it stands within our regional racing in EMSA, I'm sure we'll collectively agree to score you evenly within the F18 fleet (one class) even with the stock Hobie 18 beams. You will need to replace that big Hobie 18 jib with an F18 jib though (as you mention you are intending to do).
