Actually it'snot"whistle". It's "the hiss of death."

Really, how noisy a feather is relates very much to how it's cut (size, profile, configuration), how much helical you put on them and how well the bow is tuned.

Low profile parabolic is the quietest cut. Shield cuts are somewhat louder, butI use them because I like the look.5 1/2" magnum high profile banana feathers are pretty darn loud. But Lordy! do they stabilize an arrow fast! Of course, 6" uncut feathers are the loudest. When you're shooting fluflu's though, who cares?

A lot of people, especially traditional shooters, go way overboard when wrapping helical. I used to do it myself, until one day I bought some arrows already fletched up with much less helical and shot them side by side with my hard helical arrows. They weredefinitely quieterand shot a lot flatter at longer yardages than my arrows. And they did practically as good a job with my broadheads. So, I quit making noisy, slow,parachute fletchesand started using quite a bit less helical.

Finally, if the arrow is coming off the bow sideways, hell yes those feathers are going to scream! But they will straighten that arrow out a lot quicker than vanes will.