Surfboard Fin - Raked Conning Tower Design

237.5 mm (9 1/3") fin height (not including fin base) with a 16% thickness to chord length ratio (24 mm thick at base of the thickest part of the foiled fin surface).
Fin is hollow to reduce weight and cost (with one supporting internal rib).
Top end of fin is solid material for the first 20 mm to allow hand reshaping of this area if desired.