When you reef a Hobie 16 sail, you also have a shorter foot length and, basically, a loose foot. It's just a matter of tying down the clew to the boom and pulling it tight with a line to the end of the boom. Wouldn't matter that it is shorter than the boom, would it? The fact that the Hobie 16 HAS a boom is what would make it possible to use a smaller sail. No?