I've decided to attempt to make some fins from some shop scraps for a couple of boards in the works and am now questioning the thickness of what I have right now and am looking for advise from the experts here. I've searched through the archives and read many posts on fins and foiling and see that the advise can be all over the board. I am making a retro fish and a MiniSimmons-ish board. One set of fins is 7-1/4" x 5-1/4" (185mm x 133mm) and the other is 9-1/4" x 5-1/8" (235mm x 130mm). The main issue I have is the thickness and I'm really questioning it right now. Both sets are 7/16" (11mm) thick. After glassing them on they'll be 1/2" thick. I don't have a lot of experience with Keel fins but have researched the Naca foils and what others have done but these just feel too thick to me. The numbers tell me I'll end up with about a 7% foil but is that too thick for a single sided fin or is that more for a double foil? Most of my longboard fins are about the same thickness but they are of course doublefoils. At this point if I need to thin them down it wouldn't be a big deal.
Also, I've put the widest point of the cord length at about the 30% mark. I still have some shaping to do on the foiling but does it look like I'm on the right track as far as shaping goes?
I appreciate any and all opinions!