Not saying your wrong, and you probably know more about this than i do, but I just shot my Blazers with only a slight helical 10 times. I put a blue dot on the cock vane down blazer and 10 out of 10 times the blue dot fletching was facing down just as it was knocked on the arrow. Note that this was at about 8 yrds in my apartment so i dont know if distance has anything to do with it or not.
Arrow speed, rate of spin and distance all affect how many revolutions your arrow will make on it's way to the target. Not to mention that the fletching won't even induce spin until the arrow is some distance from the bow. The faster the bow shoots, the further the arrowtravels before the fletching catches the wind and even begins to spin and stabilize it.
We'll play with Dubbya's numbers 300 fps, 1100 rpm. Your target is at 8 yards or 24 feet. At 300 fps, the arrow will strike the target in .08 second. 1100 rpm is 18.3 rounds per second. 18.3 X .08 = 1.46
So, the very most your arrow could spin in 24 ft is 1 1/2 revolutions,and it's not likely to startspinning at all in that short of a distance.
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Thanks Arthur! I figured it would probably take some time to start spinning I just didnt know how long, and at what distance it would start.