Informative link, Rolf!

What are the Reynolds numbers' range for typical F16 - F18 - F20 type of cats?

Does anyone know the pros and cons of NACA 0008 vs NACA 6308 foils for the cat types mentioned above?

Has anyone knowledge of profiles with concave surfaces between the point of max thickness and trailing edge?

I suppose dagger board and rudder require very different foil profiles.

Stein