RE: Arrow Noise?
yooper
I have used feathers for many years and have never had any experience where I concluded that noise created by feathers alone caused a miss or a hit where I was not aiming. However, when using feathers, helical will cause feathers to be louder. I suggest straight fletch or no more than a 1 or 2 degree offset.
Considering a deer's peripheral vision capability vs. yours, and that a deer uses and relies on its peripheral vision for survival purposes more than you do or can; and considering a deer's acute hearing ability vs. yours, do not dismiss that the buck might have visually detected a movement you made or that he might have heard a bow sound that you cannot hear or do not hear in the same decibel range.
No matter how quiet you believe your bow is, I doubt that your bow, or any bow, is so quiet that a deer does not detect string sound and/or sounds a bow might make. If a deer is on alert and standing on springs, he or she will bolt at a slighter sound than they would if somewhat relaxed.