What about the research field of a 3.20 to 3.80m board without daggerboard, but with a deep fin, may be two positions, and enough rail to go well upwind ?
This board could be as light as 9 to 10 kgs, without the factory nightmare which is the dagerboard hole,( which is very costly also.)
Fairly fast upwind, and in sub planning conditions, very close to the formula performance in planning conditions, much easier than the formula in strong wind, and downwind...
I have no memory of such a concept...
Am I wrong?