I didn't say 'take the jib off' I said 'move that same sail area to the main'

Jake, if you and Wouter are correct, then answer this:

--Why are A-Cats unirig?

--Why, when the rules provide for the choice to divide the 18 square meter sail area however one likes, is the predominant sail plan choice for 18sqM, unirig?

--Why are the C-Cats unirig?

--Why are the 18HT boats unirig, with hi-aspect chute for downwind, (which incidentally seems to me to be the optimum sail plan, best of both?)

--ergo, why unirig?

I mean, you yourself said, "since having it all in the main is more efficient"

Why would that be? Unirigs get tanked on a reach, and it gets tanked downwind for sure. There must be SOME advantage...?