Wayne, wasn’t it you who was debating here about making the boat easier to sail for the average and beginner sailor?
I had several foil discussions with a couple of the C class guys when the A class first began this debate. Their view was that they were not really able to improve performance effectively over straight foils in anything but a relatively narrow set of conditions. And, application to even smaller length boats like the A would make this even worse. 4 years into it and the A debate remains in limbo. Even on the 90 Dog boats the curved to straight choice followed a very specific conditions window.

Using the very simplest physics: If a curved dagger provides lift, it will do so with a bow up position theoretically reducing the wetted surface some at the expense of some additional foil drag. Place the hull in a bow down position and you have both drag and additional wetted surface as the boat is pulled down into the water. A 20 usually is more stable than an 18 or 16 but still crew skill in maintaining the proper attitude is critical to making the boat go and several orders of magnitude more important having curved foils.

At the end of the day, you have a boat that is debatably faster in certain range conditions, but is even more technically challenging to bring to its peak performance and less applicable to the new or average driver.

But you have bling and something for the technowiennies to debate endlessly on forums.