The more helical you put on your fletching, the more stable your arrow will fly. On the other hand, you can put enough helical on fletching that they will slow down your arrows and create more noise than necessary.
Yes, this is why I was asking. I remember reading somewhere that excessive helical will create excessive drag which in turn will reduce arrow speed. What I was curious about is finding the right balance for a given arrow for good stability without losing more speed than necessary.
A light, skinny carbon arrow is easier to spin than a fat aluminum (say a 2315 for example), so it needs less fletch and less helical than you'd need on the 2315.
So then for a carbon arrow, being lighter and easier to spin compared to aluminums, will a 3 feather fletcing (4 inch feathers) done with an offset rather than an extreme helical achieve that balance, even using broadheads?