I would think Hobie and Nacra not interested in building/selling an F16 because it might compete directly against their already popular F18 products and 17 foot products, even though the 17's have not caught on as they might have hoped, but I think that's only because there was no real "F17" box rule where you could have a Nacra F17 racing straight up against a Hobie FX1.

I think if Hobie had come up with something like the Nacra 20, back in 1998, there would have developed a real F20 class as well. But then the F18 class would have not caught on as quickly over here in the US.

Too few customers, too many different classes.