The color of the vane at the beginning of the post is a mistake actually. In the prototype stage we have to add colorant that is not bonded to the plastic. the picture is actually much more appealing than the real thing. Holding it in my hand it looks more like a slightly brownish pink than the bright pink colored vane at the beginning of this thread.

We have fletched them helical. All that really happens is even faster rotational acceleration and quicker stability. But once again at 5 turns in 3 yards the rotational acceleration slow down while the high spin rate is maintained.