Several different props were tested out:
12-foot Curtis Electric
13-foot Curtis symmetric paddle blade
13-foot Hamilton Standard paddle blade
I have a reference book at home I can check to see which would be closest for the N, if I don't have the exact one I'll send you the one that looks the closest to being right.
Toss me the address you want it send to with a message and I'll try to get it mailed sometime around the first of the week.