This is strictly out of curiosity, I was wondering about other shooters experience with Three 5" shield cut helical fletches being noisy? I have had probably 5 dozen or so and the only ones that have all been quiet are an Arrowsmith's "custom cut" that are exactly 1/2" high max. The funny thing has been that it's never the entire dozen that are noisy, recently I got a doz. Sitka Spruce, they are straight, no gaps in the glue, fly GREAT and 5 of them hiss all the way to the target. I have never noticed the same set-up in parabolic being noisy.