Hello all, I need some advice. I'm doing a science project on the shape of surfboard fins in relation to the drag generated. I need to choose on variable to change in the design of the fins (Rake, Hieght, Base length, Thickness, ect.), but this variable needs to affect the drag of the board so that I can get results. So what so you guys think I should do, what single variable greatest affects the drag of the board?