Black frog, I'd imagine that those tests were done in a windtunnel type tester. To try to shed light on the other question, I would have to say that the farther the arrow travels...the faster it will spin. With these vanes, the air pressure itself is decreased on the groove side allowing the vane to fall into that low pressure space, this is a continuous motion with the vanes falling continuously into the low pressure area. The faster the arrow spins the lower the pressure and subsequently the faster the vanes fall.

Now think about feathers will full helical...When an arrow leaves the bow with feathers, the accelerated force probably bends the feathers over backwards, they then have to catch up with the arrow and cause lots of drag before they actually spin the arrow. This causes massive speed loss.

These vanes work on totally different principles than feathers. The vanes when fletched straight, don't spin the arrow by creating drag in a helix motion, but by actually streamlining the air in a cleaner fasion on one side of the vane, thus you'll have a faster arrow downrange that is also spinning faster. More accurate with fixed heads, and much more energy to break through those rib bones.


cpickands, please correct me if I'm wrong. I'm just explaining on what I feel the physics are behind this vanes operation. I'm really gonna love shooting with these things.