Once I watched a slow-motion video about arrows comming from a bow......
They start spinning some 2 feet after the arrow went over the rest......
This was with off-set vanes.
I was told helical would be better for broadhead tuning, but I can get mine flying deadly strait with off-set vanes to.
I think its in the carbon shaft tho.....
Does anyone still powder their vanes to see IF they scratch the rest?
This is still a well proven method to see if everything passes your bow in good order.....