I had a "flapper" on one of my vanes sounded like a mad bumble bee so I took some scissors and cut it out, not the whole vane just the flap,flight wasn't affected and it is a lot quieter!
ORIGINAL: gmil6184
If it is plastic you will probably want to change it before you hunt with it, plastic tends to be affected more by rips and sometimes flap around and get real noisy. If you shoot feathers then I wouldn't worry about it at all, it shouldn't effect your flight in the slightest and wont make any noise...part of the reason why I only shoot feathers