Thanks for swampcollie's reply-I had forgotten about that of the right vs left wing thing since I only use right wing for my right helical for so long,it's been AGES since I've ordered feathers. What I personally use is 5" helical and NEVER have a problem after tuning bow/arrows with flight with almost any broadhead I've ever tried.All I can say is to my way of thinking,there's no such thing as too much stability or too much accuracy. Sure,other setups or vanes will do the job,but I seriously doubt that my 5" helical feathers are slowing my arrows down much within my acceptable range.