I don't believe that I saw Byron's fletching fletching video. I do know that Howard Hill also recommended three 5-5.5" feathers (both shot longbows). Personally, I use a 5" parabolic feather and shoot them up to about 60yards. I've tried all types of shapes including Pope and Young but found the parabolic to be the quietest in flight. Howard also used the parabolics because of the same reason.

I do try to get the best helical I can get on them though as the seem to stabilize a fixed broadhead the best.You can really get a great helical on a tapered shaft.